Returns true if this string contains a match of other:
Returns true if this string contains a match of other:
var string = 'Dart strings';
string.contains('D'); // true
string.contains(new RegExp(r'[A-Z]')); // true
If startIndex is provided, this method matches only at or after that index:
string.contains('X', 1); // false
string.contains(new RegExp(r'[A-Z]'), 1); // false
startIndex must not be negative or greater than length.