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String.indexOf()
Description
Finds the position of the first occurrence of a character or a string inside another string. By default, searches from the beginning of the String, but can also start from a given index, allowing for the locating of all instances of the character or String.
Syntax
myString.indexOf(val)
myString.indexOf(val, from)
Parameter Values
- myString: a variable of type String.
- val: the value to search for. Allowed data types: char, String.
- from: the index to start the search from.
Return Values
- The index of val within the String, or -1 if not found.
Example Code
void setup() {
Serial.begin(9600);
String myString = "Arduino, ArduinoGetStarted.com";
int index = myString.indexOf("Arduino");
Serial.println(index);
}
void loop() {
}
The result on Serial Monitor:
COM6
0
Autoscroll
Clear output
9600 baud
Newline
※ NOTES AND WARNINGS:
If the string is modified, it is highly recommended using String.reserve() to prevent the memory fragmentation issue
See Also
- Language : Arduino - String
- Language : String.c_str()
- Language : String.charAt()
- Language : String.compareTo()
- Language : String.concat()
- Language : String.endsWith()
- Language : String.equals()
- Language : String.equalsIgnoreCase()
- Language : String.getBytes()
- Language : String.lastIndexOf()
- Language : String.length()
- Language : String.remove()
- Language : String.replace()
- Language : String.reserve()
- Language : String.setCharAt()
- Language : String.startsWith()
- Language : String.substring()
- Language : String.toCharArray()
- Language : String.toDouble()
- Language : String.toFloat()
- Language : String.toInt()
- Language : String.toLowerCase()
- Language : String.toUpperCase()
- Language : String.trim()
- Example : String Tutorials
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