.toMatch()

This assertion checks whether a strings contains a value or satisfies a regex.

String

jestUnexpected('foo').toMatch('bar');

expected 'foo' to match MatchSpec({ spec: 'bar', value: undefined, nested: false })

foo

You can also specify the value the property must have.

jestUnexpected('fooobar').toMatch(/f[o]{2}bar/);

expected 'fooobar'

to match MatchSpec({ spec: /f[o]{2}bar/, value: undefined, nested: false })