String::indexOf() \ Language (API) \ Wiring ALPHA 1.0
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Reference for Wiring version 0027+. If you have a previous version, use the reference included with your software. If you see any errors or have any comments, let us know.
Class
String
Name
indexOf()
Examples
// declares s1 with an initial string
String s1 = String("string number one");
byte bytes[20]; // array of bytes
char array[20]; // array of chars
void setup() {
Serial.begin(9600);
// turn ON wiring hardware LED
pinMode(48, OUTPUT);
digitalWrite(48, HIGH);
// s2 holds "10000"
String s2 = String(10000);
Serial.println("s2 holds: " + s2);
// s3 holds "567000"
String s3 = String(567000, DEC);
Serial.println("s3 holds: " + s3);
// s4 holds "string number four"
String s4 = "string number four";
Serial.println("s4 holds: " + s4);
// use + operator to add a string
s4 += " plus another part";
// user + operator when printing to serial
Serial.println("now s4 holds: " + s4);
// get character at position 5
char c = s4.charAt(5);
Serial.print("c holds: ");
Serial.println(c); // prints 'g'
// s5 holds "string number one"
String s5 = String("string number one");
int cmp = s1.compareTo(s5); // compare s1 to s5
if(cmp == 0) {
Serial.println("s1 and s5 are equal"); // prints equal
} else {
Serial.println("s1 and s5 are different");
}
// check if s5 ends with "one"
if(s5.endsWith("one"))
// prints "s5 ends with "one""
Serial.println("s5 ends with "one"");
if(s1.equals(s5)) // check if s1 equal to s5
Serial.println("s1 and s5 are equal"); // prints equal
// s6 holds "string NUMBER one"
String s6 = String("string NUMBER one");
// check if s5 and s6 are equal ignoring case differences
if(s5.equalsIgnoreCase(s6))
// prints equal
Serial.println("s6 and s5 are equal ignoring the case");
Serial.print("index of char R pn s6 is: ");
Serial.println(s6.indexOf('R'), DEC); // prints 12
Serial.print("index of char R on s6 from index 13 is: ");
// prints -1, not found
Serial.println(s6.indexOf('R', 13), DEC);
String s7 = s6.substring(7, 13);
Serial.println("s7 is: "+s7); // prints "NUMBER"
Serial.print("index of string "NUMBER" on s6 is: ");
Serial.println(s6.indexOf(s7), DEC); // prints 7
Serial.print("last index of char 'n' on s6 is: ");
Serial.println(s6.lastIndexOf('n'), DEC); // prints 15
Serial.print("length of s6 is: ");
Serial.println(s6.length(), DEC); // prints 15
// set character at index 15 to 'N'
s6.setCharAt(15, 'N');
// prints "string NUMBER oNe"
Serial.println("s6 is: "+s6);
// check if s6 starts with "string"
if(s6.startsWith("string"))
// s6 starts with "string" string
Serial.println("s6 starts with "string"");
// prints "string number one"
Serial.println("s6 to lower case is: "+s6.toLowerCase());
// prints "STRING NUMBER ONE"
Serial.println("s6 to upper case is: "+s6.toUpperCase());
s6.concat(" plus spaces at the end "); // concat a string
// prints "string NUMBER oNe plus spaces at the end "
Serial.println("s6 is: "+s6);
// prints "string NUMBER oNe plus spaces at the end"
Serial.println("trim of s6 is: "+s6.trim());
// prints "string NUMBER oN5 plus spac5s at th5 5nd"
Serial.println("s6 is: "+s6.replace('e', '5'));
// get the byte array in the array bytes
s6.getBytes(bytes, 20);
Serial.print("array bytes is: ");
for(int i=0; i
Wiring is an open project initiated by Hernando Barragán. It is developed by a small team of volunteers.
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