typed-utilities/src/__tests__/RegExp.test.ts

Strongly typed general purpose utilities

import { range, dateIsoStringRegExp, naiveEmailRegExp } from "..";

describe(`RegExp`, () => {
  test(`dateIsoStringRegExp`, () => {
    const now = new Date();
    const isoString = now.toISOString();
    expect(isoString).toMatch(dateIsoStringRegExp);
    expect(` ${isoString}`).not.toMatch(dateIsoStringRegExp);
    expect(now.toString()).not.toMatch(dateIsoStringRegExp);
  });

  test(`naiveEmailRegExp`, () => {
    expect(`user@domain.tld`).toMatch(naiveEmailRegExp);
    expect(`user-domain-tld`).not.toMatch(naiveEmailRegExp);
    const veryLongSubDomain = range(100)
      .map(() => `subdomain`)
      .join(`.`);
    const veryLongDomain = `domain`.repeat(100);
    const veryLongTld = `tld`.repeat(100);
    const veryLongUser = range(100)
      .map(() => `user`)
      .join(`.`);
    const veryLongModifier = range(100)
      .map(() => `modifier`)
      .join(`+`);
    expect(
      `${veryLongUser}+${veryLongModifier}@${veryLongSubDomain}.${veryLongDomain}.${veryLongTld}`,
    ).toMatch(naiveEmailRegExp);
  });
});