String.contains
contains(match, ignoreCase = false)
Description
Check for the existence of match and return true or false.
match may be a String or a Regex pattern.
'abcdef'.contains('def');
//= true
'abcdef'.contains('xyz');
//= false
'abcdef'.contains('CDE', true);
//= true
Examples of Regex patterns:
'123 456'.contains(r'\d+ \d+');
//= true
'123'.contains(r'[a-z]');
//= false
'Abc 123'.contains(r'abc \d+'.flags('i'));
//= true