Function toThrowExpectedRegExp

packages/expect/src/toThrowMatchers.ts:145–180

(
  matcherName: string,
  options: MatcherHintOptions,
  thrown: Thrown | null,
  expected: RegExp,
)

};

const toThrowExpectedRegExp = (
  matcherName: string,
  options: MatcherHintOptions,
  thrown: Thrown | null,
  expected: RegExp,
): SyncExpectationResult => {
  const pass = thrown !== null && expected.test(thrown.message);

  const message = pass
    ? () =>
        // eslint-disable-next-line prefer-template
        matcherHint(matcherName, undefined, undefined, options) +
        '\n\n' +
        formatExpected('Expected pattern: not ', expected) +
        (thrown !== null && thrown.hasMessage
          ? formatReceived(
              'Received message:     ',
              thrown,
              'message',
              expected,
            ) + formatStack(thrown)
          : formatReceived('Received value:       ', thrown, 'value'))
    : () =>
        // eslint-disable-next-line prefer-template
        matcherHint(matcherName, undefined, undefined, options) +
        '\n\n' +
        formatExpected('Expected pattern: ', expected) +
        (thrown === null
          ? `\n${DID_NOT_THROW}`
          : thrown.hasMessage
            ? formatReceived('Received message: ', thrown, 'message') +
              formatStack(thrown)
            : formatReceived('Received value:   ', thrown, 'value'));

  return {message, pass};
};

type AsymmetricMatcher = {
  asymmetricMatch: (received: unknown) => boolean;