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.
bool contains(Pattern other, [int startIndex = 0]);
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.5.0/dart-core/String/contains.html