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.55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">Client API</span><meta content="1" itemprop="position"/></li><li class="breadcrumbs__item breadcrumbs__item--active" itemprop="itemListElement" itemscope="" itemtype="https://schema.org/ListItem"><span class="breadcrumbs__link" itemprop="name">Matchers</span><meta content="2" itemprop="position"/></li></ul></nav><span class="theme-doc-version-badge badge badge--secondary">Version: 20.x</span><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button class="clean-btn tocCollapsibleButton_TO0P" type="button">On this page</button></div><div class="theme-doc-markdown markdown"><h1>Matchers</h1><p>Detox uses <a href="/docs/api/matchers">matchers</a> to match UI elements in your app.</p><p>Use <a href="/docs/api/actions">actions</a> to simulate use interaction with elements and <a href="/docs/api/expect">expectations</a> to verify element states.</p><p><strong>Note:</strong> For best results, it is recommended to match elements by unique identifiers. Matching by text or labels can introduce test flakiness when your app’s text change or when changing your app’s localization.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="methods">Methods<a aria-label="Direct link to Methods" class="hash-link" href="#methods" title="Direct link to Methods">​</a></h2><ul><li><a href="#byidid"><code>by.id()</code></a></li><li><a href="#bylabellabel"><code>by.label()</code></a></li><li><a href="#bytexttext"><code>by.text()</code></a></li><li><a href="#bytypeclassname"><code>by.type()</code></a></li><li><a href="#bytraitstraits-ios-only"><code>by.traits()</code></a> <strong>iOS Only</strong></li><li><a href="#withancestormatcher"><code>withAncestor()</code></a></li><li><a href="#withdescendantmatcher"><code>withDescendant()</code></a></li><li><a href="#andmatcher"><code>and()</code></a></li><li><a href="#atindexindex"><code>atIndex()</code></a></li></ul><h3 class="anchor anchorWithStickyNavbar_LWe7" id="byidid"><code>by.id(id)</code><a aria-label="Direct link to byidid" class="hash-link" href="#byidid" title="Direct link to byidid">​</a></h3><p>Match elements with the specified accessibility identifier. In React Native, this corresponds to the value in the <a href="/_404.html" rel="noopener noreferrer" target="_blank"><code>testID</code></a> prop.</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color: #F8F8F2; --prism-background-color: #282A36;"><div class="codeBlockContent_biex"><pre class="prism-code language-js codeBlock_bY9V thin-scrollbar" tabindex="0"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color: rgb(248, 248, 242);"><span class="token function" style="color: rgb(80, 250, 123);">element</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token plain">by</span><span class="token punctuation" style="color: rgb(248, 248, 242);">.</span><span class="token method function property-access" style="color: rgb(80, 250, 123);">id</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token string" style="color: rgb(255, 121, 198);">'tap_me'</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">;</span><br/></span></code></pre><div class="buttonGroup__atx"><button aria-label="Copy code to clipboard" class="clean-btn" title="Copy" type="button"><span aria-hidden="true" class="copyButtonIcons_eSgA"><svg class="copyButtonIcon_y97N" viewbox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z" fill="currentColor"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewbox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z" fill="currentColor"></path></svg></span></button></div></div></div><p>Supports <a href="#regex-matching">regex matching</a>.</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color: #F8F8F2; --prism-background-color: #282A36;"><div class="codeBlockContent_biex"><pre class="prism-code language-js codeBlock_bY9V thin-scrollbar" tabindex="0"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color: rgb(248, 248, 242);"><span class="token function" style="color: rgb(80, 250, 123);">element</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token plain">by</span><span class="token punctuation" style="color: rgb(248, 248, 242);">.</span><span class="token method function property-access" style="color: rgb(80, 250, 123);">id</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token regex regex-delimiter">/</span><span class="token regex regex-source language-regex">^tap_[a-z]+$</span><span class="token regex regex-delimiter">/</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">;</span><br/></span></code></pre><div class="buttonGroup__atx"><button aria-label="Copy code to clipboard" class="clean-btn" title="Copy" type="button"><span aria-hidden="true" class="copyButtonIcons_eSgA"><svg class="copyButtonIcon_y97N" viewbox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z" fill="currentColor"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewbox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z" fill="currentColor"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="bylabellabel"><code>by.label(label)</code><a aria-label="Direct link to bylabellabel" class="hash-link" href="#bylabellabel" title="Direct link to bylabellabel">​</a></h3><p>Match elements with the specified accessibility label (iOS) or content description (Android). In React Native, this corresponds to the value in the <a href="/_404.html" rel="noopener noreferrer" target="_blank"><code>accessibilityLabel</code></a> prop.</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color: #F8F8F2; --prism-background-color: #282A36;"><div class="codeBlockContent_biex"><pre class="prism-code language-js codeBlock_bY9V thin-scrollbar" tabindex="0"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color: rgb(248, 248, 242);"><span class="token function" style="color: rgb(80, 250, 123);">element</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token plain">by</span><span class="token punctuation" style="color: rgb(248, 248, 242);">.</span><span class="token method function property-access" style="color: rgb(80, 250, 123);">label</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token string" style="color: rgb(255, 121, 198);">'Welcome'</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">;</span><br/></span></code></pre><div class="buttonGroup__atx"><button aria-label="Copy code to clipboard" class="clean-btn" title="Copy" type="button"><span aria-hidden="true" class="copyButtonIcons_eSgA"><svg class="copyButtonIcon_y97N" viewbox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z" fill="currentColor"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewbox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z" fill="currentColor"></path></svg></span></button></div></div></div><p>Supports <a href="#regex-matching">regex matching</a>.</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color: #F8F8F2; --prism-background-color: #282A36;"><div class="codeBlockContent_biex"><pre class="prism-code language-js codeBlock_bY9V thin-scrollbar" tabindex="0"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color: rgb(248, 248, 242);"><span class="token function" style="color: rgb(80, 250, 123);">element</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token plain">by</span><span class="token punctuation" style="color: rgb(248, 248, 242);">.</span><span class="token method function property-access" style="color: rgb(80, 250, 123);">label</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token regex regex-delimiter">/</span><span class="token regex regex-source language-regex">[a-z]+</span><span class="token regex regex-delimiter">/</span><span class="token regex regex-flags">i</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">;</span><br/></span></code></pre><div class="buttonGroup__atx"><button aria-label="Copy code to clipboard" class="clean-btn" title="Copy" type="button"><span aria-hidden="true" class="copyButtonIcons_eSgA"><svg class="copyButtonIcon_y97N" viewbox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z" fill="currentColor"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewbox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z" fill="currentColor"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="bytexttext"><code>by.text(text)</code><a aria-label="Direct link to bytexttext" class="hash-link" href="#bytexttext" title="Direct link to bytexttext">​</a></h3><p>Match elements with the specified text.</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color: #F8F8F2; --prism-background-color: #282A36;"><div class="codeBlockContent_biex"><pre class="prism-code language-js codeBlock_bY9V thin-scrollbar" tabindex="0"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color: rgb(248, 248, 242);"><span class="token function" style="color: rgb(80, 250, 123);">element</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token plain">by</span><span class="token punctuation" style="color: rgb(248, 248, 242);">.</span><span class="token method function property-access" style="color: rgb(80, 250, 123);">text</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token string" style="color: rgb(255, 121, 198);">'Tap Me'</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">;</span><br/></span></code></pre><div class="buttonGroup__atx"><button aria-label="Copy code to clipboard" class="clean-btn" title="Copy" type="button"><span aria-hidden="true" class="copyButtonIcons_eSgA"><svg class="copyButtonIcon_y97N" viewbox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z" fill="currentColor"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewbox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z" fill="currentColor"></path></svg></span></button></div></div></div><p>Supports <a href="#regex-matching">regex matching</a>.</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color: #F8F8F2; --prism-background-color: #282A36;"><div class="codeBlockContent_biex"><pre class="prism-code language-js codeBlock_bY9V thin-scrollbar" tabindex="0"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color: rgb(248, 248, 242);"><span class="token function" style="color: rgb(80, 250, 123);">element</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token plain">by</span><span class="token punctuation" style="color: rgb(248, 248, 242);">.</span><span class="token method function property-access" style="color: rgb(80, 250, 123);">text</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token regex regex-delimiter">/</span><span class="token regex regex-source language-regex">^Tap .*$</span><span class="token regex regex-delimiter">/</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">;</span><br/></span></code></pre><div class="buttonGroup__atx"><button aria-label="Copy code to clipboard" class="clean-btn" title="Copy" type="button"><span aria-hidden="true" class="copyButtonIcons_eSgA"><svg class="copyButtonIcon_y97N" viewbox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z" fill="currentColor"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewbox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z" fill="currentColor"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="bytypeclassname"><code>by.type(className)</code><a aria-label="Direct link to bytypeclassname" class="hash-link" href="#bytypeclassname" title="Direct link to bytypeclassname">​</a></h3><p>Matches elements whose class is, or inherits from, the specified class name. On Android, provide the class canonical name.</p><p><strong>Note:</strong> iOS and Android class names differ.</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color: #F8F8F2; --prism-background-color: #282A36;"><div class="codeBlockContent_biex"><pre class="prism-code language-js codeBlock_bY9V thin-scrollbar" tabindex="0"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color: rgb(248, 248, 242);"><span class="token function" style="color: rgb(80, 250, 123);">element</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token plain">by</span><span class="token punctuation" style="color: rgb(248, 248, 242);">.</span><span class="token method function property-access" style="color: rgb(80, 250, 123);">type</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token string" style="color: rgb(255, 121, 198);">'RCTImageView'</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">;</span><span class="token plain"> </span><span class="token comment" style="color: rgb(98, 114, 164);">//iOS class name</span><span class="token plain"></span><br/></span><span class="token-line" style="color: rgb(248, 248, 242);"><span class="token plain"></span><span class="token function" style="color: rgb(80, 250, 123);">element</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token plain">by</span><span class="token punctuation" style="color: rgb(248, 248, 242);">.</span><span class="token method function property-access" style="color: rgb(80, 250, 123);">type</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token string" style="color: rgb(255, 121, 198);">'android.widget.ImageView'</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">;</span><span class="token plain"> </span><span class="token comment" style="color: rgb(98, 114, 164);">//Android class canonical name</span><br/></span></code></pre><div class="buttonGroup__atx"><button aria-label="Copy code to clipboard" class="clean-btn" title="Copy" type="button"><span aria-hidden="true" class="copyButtonIcons_eSgA"><svg class="copyButtonIcon_y97N" viewbox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z" fill="currentColor"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewbox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z" fill="currentColor"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="bytraitstraits-ios-only"><code>by.traits([traits])</code> <strong>iOS Only</strong><a aria-label="Direct link to bytraitstraits-ios-only" class="hash-link" href="#bytraitstraits-ios-only" title="Direct link to bytraitstraits-ios-only">​</a></h3><p>Matches elements by their <a href="/_404.html" rel="noopener noreferrer" target="_blank">accessibility traits</a>.</p><p>Currently supported values:</p><p><code>"none"</code>
<code>"button"</code>
<code>"link"</code>
<code>"header"</code>
<code>"searchField"</code>
<code>"image"</code>
<code>"selected"</code>
<code>"playsSound"</code>
<code>"keyboardKey"</code>
<code>"staticText"</code>
<code>"summaryElement"</code>
<code>"notEnabled"</code>
<code>"updatesFrequently"</code>
<code>"startsMediaSession"</code>
<code>"adjustable"</code>
<code>"allowsDirectInteraction"</code>
<code>"causesPageTurn"</code>
<code>"tabBar"</code></p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color: #F8F8F2; --prism-background-color: #282A36;"><div class="codeBlockContent_biex"><pre class="prism-code language-js codeBlock_bY9V thin-scrollbar" tabindex="0"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color: rgb(248, 248, 242);"><span class="token function" style="color: rgb(80, 250, 123);">element</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token plain">by</span><span class="token punctuation" style="color: rgb(248, 248, 242);">.</span><span class="token method function property-access" style="color: rgb(80, 250, 123);">traits</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token punctuation" style="color: rgb(248, 248, 242);">[</span><span class="token string" style="color: rgb(255, 121, 198);">'button'</span><span class="token punctuation" style="color: rgb(248, 248, 242);">]</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">;</span><br/></span></code></pre><div class="buttonGroup__atx"><button aria-label="Copy code to clipboard" class="clean-btn" title="Copy" type="button"><span aria-hidden="true" class="copyButtonIcons_eSgA"><svg class="copyButtonIcon_y97N" viewbox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z" fill="currentColor"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewbox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z" fill="currentColor"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="withancestormatcher"><code>withAncestor(matcher)</code><a aria-label="Direct link to withancestormatcher" class="hash-link" href="#withancestormatcher" title="Direct link to withancestormatcher">​</a></h3><p>Matches elements with an ancestor that matches the specified matcher.</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color: #F8F8F2; --prism-background-color: #282A36;"><div class="codeBlockContent_biex"><pre class="prism-code language-js codeBlock_bY9V thin-scrollbar" tabindex="0"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color: rgb(248, 248, 242);"><span class="token function" style="color: rgb(80, 250, 123);">element</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token plain">by</span><span class="token punctuation" style="color: rgb(248, 248, 242);">.</span><span class="token method function property-access" style="color: rgb(80, 250, 123);">id</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token string" style="color: rgb(255, 121, 198);">'child'</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">.</span><span class="token method function property-access" style="color: rgb(80, 250, 123);">withAncestor</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token plain">by</span><span class="token punctuation" style="color: rgb(248, 248, 242);">.</span><span class="token method function property-access" style="color: rgb(80, 250, 123);">id</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token string" style="color: rgb(255, 121, 198);">'parent'</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">;</span><br/></span></code></pre><div class="buttonGroup__atx"><button aria-label="Copy code to clipboard" class="clean-btn" title="Copy" type="button"><span aria-hidden="true" class="copyButtonIcons_eSgA"><svg class="copyButtonIcon_y97N" viewbox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z" fill="currentColor"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewbox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z" fill="currentColor"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="withdescendantmatcher"><code>withDescendant(matcher)</code><a aria-label="Direct link to withdescendantmatcher" class="hash-link" href="#withdescendantmatcher" title="Direct link to withdescendantmatcher">​</a></h3><p>Matches elements with at least one descendant that matches the specified matcher.</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color: #F8F8F2; --prism-background-color: #282A36;"><div class="codeBlockContent_biex"><pre class="prism-code language-js codeBlock_bY9V thin-scrollbar" tabindex="0"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color: rgb(248, 248, 242);"><span class="token function" style="color: rgb(80, 250, 123);">element</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token plain">by</span><span class="token punctuation" style="color: rgb(248, 248, 242);">.</span><span class="token method function property-access" style="color: rgb(80, 250, 123);">id</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token string" style="color: rgb(255, 121, 198);">'parent'</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">.</span><span class="token method function property-access" style="color: rgb(80, 250, 123);">withDescendant</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token plain">by</span><span class="token punctuation" style="color: rgb(248, 248, 242);">.</span><span class="token method function property-access" style="color: rgb(80, 250, 123);">id</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token string" style="color: rgb(255, 121, 198);">'child'</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">;</span><br/></span></code></pre><div class="buttonGroup__atx"><button aria-label="Copy code to clipboard" class="clean-btn" title="Copy" type="button"><span aria-hidden="true" class="copyButtonIcons_eSgA"><svg class="copyButtonIcon_y97N" viewbox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z" fill="currentColor"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewbox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z" fill="currentColor"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="andmatcher"><code>and(matcher)</code><a aria-label="Direct link to andmatcher" class="hash-link" href="#andmatcher" title="Direct link to andmatcher">​</a></h3><p>Matches elements by combining several matchers together.</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color: #F8F8F2; --prism-background-color: #282A36;"><div class="codeBlockContent_biex"><pre class="prism-code language-js codeBlock_bY9V thin-scrollbar" tabindex="0"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color: rgb(248, 248, 242);"><span class="token function" style="color: rgb(80, 250, 123);">element</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token plain">by</span><span class="token punctuation" style="color: rgb(248, 248, 242);">.</span><span class="token method function property-access" style="color: rgb(80, 250, 123);">id</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token string" style="color: rgb(255, 121, 198);">'uniqueId'</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">.</span><span class="token method function property-access" style="color: rgb(80, 250, 123);">and</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token plain">by</span><span class="token punctuation" style="color: rgb(248, 248, 242);">.</span><span class="token method function property-access" style="color: rgb(80, 250, 123);">text</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token string" style="color: rgb(255, 121, 198);">'some text'</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">;</span><br/></span></code></pre><div class="buttonGroup__atx"><button aria-label="Copy code to clipboard" class="clean-btn" title="Copy" type="button"><span aria-hidden="true" class="copyButtonIcons_eSgA"><svg class="copyButtonIcon_y97N" viewbox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z" fill="currentColor"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewbox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z" fill="currentColor"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="atindexindex"><code>atIndex(index)</code><a aria-label="Direct link to atindexindex" class="hash-link" href="#atindexindex" title="Direct link to atindexindex">​</a></h3><p>If a matcher resolves into multiple matched UI elements, you may specify which element to use by its index.</p><p>On iOS, matched elements are sorted by their x and y axes.</p><p><strong>Note:</strong> Due to different underlying implementations of Detox on iOS and Android, as well as other differences in the OS implementations, as well as RN implementation differences on each OS, indices may not match between iOS and Android. Relying on indices may also introduce flakiness in your tests as your app’s user interface is updated. It is recommended to use unique identifier matchers for your elements.</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color: #F8F8F2; --prism-background-color: #282A36;"><div class="codeBlockContent_biex"><pre class="prism-code language-js codeBlock_bY9V thin-scrollbar" tabindex="0"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color: rgb(248, 248, 242);"><span class="token function" style="color: rgb(80, 250, 123);">element</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token plain">by</span><span class="token punctuation" style="color: rgb(248, 248, 242);">.</span><span class="token method function property-access" style="color: rgb(80, 250, 123);">text</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token string" style="color: rgb(255, 121, 198);">'Product'</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">.</span><span class="token method function property-access" style="color: rgb(80, 250, 123);">atIndex</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token number">2</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">;</span><br/></span></code></pre><div class="buttonGroup__atx"><button aria-label="Copy code to clipboard" class="clean-btn" title="Copy" type="button"><span aria-hidden="true" class="copyButtonIcons_eSgA"><svg class="copyButtonIcon_y97N" viewbox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z" fill="currentColor"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewbox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z" fill="currentColor"></path></svg></span></button></div></div></div><h2 class="anchor anchorWithStickyNavbar_LWe7" id="regex-matching">Regex matching<a aria-label="Direct link to Regex matching" class="hash-link" href="#regex-matching" title="Direct link to Regex matching">​</a></h2><p>For supported matchers (<a href="#byidid"><code>id</code></a>, <a href="#bylabellabel"><code>label</code></a>, <a href="#bytexttext"><code>text</code></a>), you can also utilize regex (Regular Expressions) alongside certain flags. Here's a table with the supported flags:</p><table><thead><tr><th>Flag</th><th>Name</th><th>Modification</th></tr></thead><tbody><tr><td><code>i</code></td><td>Ignore Casing</td><td>Makes the expression search case-insensitively.</td></tr><tr><td><code>s</code></td><td>Dot All</td><td>Makes the wild character <code>.</code> match newlines as well.</td></tr><tr><td><code>m</code></td><td>Multiline</td><td>Makes the boundary characters (<code>^</code> and <code>$</code>) match the beginning and ending of every single line instead of the beginning and ending of the whole string.</td></tr></tbody></table><div class="theme-admonition theme-admonition-caution alert alert--warning admonition_LlT9"><div class="admonitionHeading_tbUL"><span class="admonitionIcon_kALy"><svg viewbox="0 0 16 16"><path d="M8.893 1.5c-.183-.31-.52-.5-.887-.5s-.703.19-.886.5L.138 13.499a.98.98 0 0 0 0 1.001c.193.31.53.501.886.501h13.964c.367 0 .704-.19.877-.5a1.03 1.03 0 0 0 .01-1.002L8.893 1.5zm.133 11.497H6.987v-2.003h2.039v2.003zm0-3.004H6.987V5.987h2.039v4.006z" fill-rule="evenodd"></path></svg></span>Note</div><div class="admonitionContent_S0QG"><p>Regular expression flags such as <code>g</code> (global) and <code>y</code> (sticky) that are not supported, as well as <code>u</code> (unicode) which is always implied, are ignored when parsing input.</p><p>Pay attention that as of writing this note, Android supports lookbehind assertions in its regular expression implementation, while iOS does not. It's advisable to check the official platform-specific documentation for limitations.</p></div></div><p>The following sample code snippet matches text starting with "Tap" followed by any number of alphabetic characters, case-insensitively:</p><div class="language-js codeBlockContainer_Ckt0 theme-code-block" style="--prism-color: #F8F8F2; --prism-background-color: #282A36;"><div class="codeBlockContent_biex"><pre class="prism-code language-js codeBlock_bY9V thin-scrollbar" tabindex="0"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color: rgb(248, 248, 242);"><span class="token function" style="color: rgb(80, 250, 123);">element</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token plain">by</span><span class="token punctuation" style="color: rgb(248, 248, 242);">.</span><span class="token method function property-access" style="color: rgb(80, 250, 123);">text</span><span class="token punctuation" style="color: rgb(248, 248, 242);">(</span><span class="token regex regex-delimiter">/</span><span class="token regex regex-source language-regex">Tap [A-Za-z]+</span><span class="token regex regex-delimiter">/</span><span class="token regex regex-flags">i</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">)</span><span class="token punctuation" style="color: rgb(248, 248, 242);">;</span><br/></span></code></pre><div class="buttonGroup__atx"><button aria-label="Copy code to clipboard" class="clean-btn" title="Copy" type="button"><span aria-hidden="true" class="copyButtonIcons_eSgA"><svg class="copyButtonIcon_y97N" viewbox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z" fill="currentColor"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewbox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z" fill="currentColor"></path></svg></span></button></div></div></div></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class="col"><a class="theme-edit-this-page" href="/_404.html" rel="noreferrer noopener" target="_blank"><svg aria-hidden="true" class="iconEdit_Z9Sw" fill="currentColor" height="20" viewbox="0 0 40 40" width="20"><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"></path></g></svg>Edit this page</a></div><div class="col lastUpdated_vwxv"></div></div></footer></article><nav aria-label="Docs pages" class="pagination-nav docusaurus-mt-lg"><a class="pagination-nav__link pagination-nav__link--prev" href="/docs/api/device"><div class="pagination-nav__sublabel">Previous</div><div class="pagination-nav__label">Device</div></a><a class="pagination-nav__link 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Only</strong></a></li><li><a class="table-of-contents__link toc-highlight" href="#withancestormatcher"><code>withAncestor(matcher)</code></a></li><li><a class="table-of-contents__link toc-highlight" href="#withdescendantmatcher"><code>withDescendant(matcher)</code></a></li><li><a class="table-of-contents__link toc-highlight" href="#andmatcher"><code>and(matcher)</code></a></li><li><a class="table-of-contents__link toc-highlight" href="#atindexindex"><code>atIndex(index)</code></a></li></ul></li><li><a class="table-of-contents__link toc-highlight" href="#regex-matching">Regex matching</a></li></ul></div></div></div></div></main></div></div><footer class="footer"><div class="container container-fluid"><div class="row footer__links"><div class="col footer__col footer__col_docs"><div class="footer__title">Docs</div><ul class="footer__items clean-list"><li class="footer__item"><a class="footer__link-item" href="/docs/introduction/getting-started">Getting Started</a></li><li 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