String.contains

Check for the existence of $matchString and return true or false.

If $options is -ignoreCase it will match both upper and lowercase versions of each character.

'abcdef'.contains('def')
//= true

'abcdef'.contains('xyz')
//= false

'abcdef'.contains('CDE', -ignoreCase)
//= true

Regex Patterns

The $matchString argument can also be a Regex.

// \d+ = one or more digits
'abc 123 xyz'.contains(rx'\d+')
//= true

// i = ignore case
'123 Abc Xyz'.contains(rx'(abc|def)'i)
//= true