String class


Locates a character or String within another String. By default, searches from the end of the String, but can also work backwards from a given index, allowing for the locating of all instances of the character or String.

string.lastIndexOf(val, from)

int lastIndexOf( char ch ) const;
int lastIndexOf( char ch, unsigned int fromIndex ) const;
int lastIndexOf( const String &str ) const;
int lastIndexOf( const String &str, unsigned int fromIndex ) const;


  • string: a variable of type String
  • val: the value to search for - char or String
  • from: the index to work backwards from

Returns: The index of val within the String, or -1 if not found. The index value is 0-based.