| /* | |
| String substring() | |
| Examples of how to use substring in a String | |
| created 27 Jul 2010, | |
| modified 2 Apr 2012 | |
| by Zach Eveland | |
| This example code is in the public domain. | |
| https://www.arduino.cc/en/Tutorial/BuiltInExamples/StringSubstring | |
| */ | |
| void setup() { | |
| // Open serial communications and wait for port to open: | |
| Serial.begin(9600); | |
| while (!Serial) { | |
| ; // wait for serial port to connect. Needed for native USB port only | |
| } | |
| // send an intro: | |
| Serial.println("\n\nString substring():"); | |
| Serial.println(); | |
| } | |
| void loop() { | |
| // Set up a String: | |
| String stringOne = "Content-Type: text/html"; | |
| Serial.println(stringOne); | |
| // substring(index) looks for the substring from the index position to the end: | |
| if (stringOne.substring(19) == "html") { | |
| Serial.println("It's an html file"); | |
| } | |
| // you can also look for a substring in the middle of a string: | |
| if (stringOne.substring(14, 18) == "text") { | |
| Serial.println("It's a text-based file"); | |
| } | |
| // do nothing while true: | |
| while (true); | |
| } | |