method

test.AsymmetricMatchers.stringMatching

regex: string | String | RegExp

): any;

Matches any received string that matches the regular expression.

A string is the source of a regular expression, as in new RegExp(regex). It is not searched for literally, and an invalid one throws a SyntaxError. To look for a literal string, use expect.stringContaining.

expect({ id: "user-42" }).toEqual({ id: expect.stringMatching(/^user-\d+$/) });
expect({ id: "user-42" }).toEqual({ id: expect.stringMatching("^user-\\d+$") });