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Arduino/build/shared/examples/08.Strings/StringSubstring/StringSubstring.ino

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/*
String substring()
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Examples of how to use substring in a String
created 27 July 2010,
modified 2 Apr 2012
by Zach Eveland
http://www.arduino.cc/en/Tutorial/StringSubstring
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This example code is in the public domain.
*/
void setup() {
// Open serial communications and wait for port to open:
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Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for Leonardo only
}
// send an intro:
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Serial.println("\n\nString substring():");
Serial.println();
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}
void loop() {
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// Set up a String:
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String stringOne = "Content-Type: text/html";
Serial.println(stringOne);
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// 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");
}
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// 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");
}
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// do nothing while true:
while (true);
}