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Find if a string begins with a specific set of characters in Arduino
The startsWith() function in Arduino helps you determine if a string starts with a specific set of characters. It returns true if the string starts with the substring you specified, else it returns false. An example implementation is given below −
Example
void setup() { // put your setup code here, to run once: Serial.begin(9600); String String1 = "AB_Test"; String String2 = "CD_Test"; String substr1 = "AB"; String substr2 = "AB*"; if(String1.startsWith(substr1)){ Serial.print("String1 starts with substr1"); } if(String2.startsWith(substr1)){ Serial.print("String2 starts with substr1"); } if(String1.startsWith(substr2)){ Serial.print("String1 starts with substr2"); } if(String2.startsWith(substr2)){ Serial.print("String2 starts with substr2"); } } void loop() { // put your main code here, to run repeatedly }
As you can expect, this program will print "String1 starts with substr1" only. The corresponding Serial Monitor output is shown below (the garbage characters in the beginning are programming/ start-up noise) −
Output
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