index.spec.js

const {
  whole,
  repeat,
  alpha,
  numeric,
  and,
  or,
  wildcard,
  extra,
  capture,
  group,
  matchers,
  regex,
  flags,
  look
} = require('.')
describe('rexrex', () => {
  test('regex', () => {
    const rex = regex(
      whole(or(numeric(7), capture(alpha(0, 3)), extra(matchers.ANY, matchers.LAZY))),
      and(flags.GLOBAL, flags.INSENSITIVE)
    )
    expect(rex).toEqual(/^\d{7}|([A-z]{0,3})|.+?$/gi)
  })
  test('wildcard and lazy matchers', () => {
    let rex = or(wildcard('2', matchers.LAZY), extra('4', false))
    expect(rex).toEqual('2*?|4+')
    rex = or(wildcard('2'), extra('4', true))
    expect(rex).toEqual('2*|4+?')
  })
  test('flags', () => {
    expect(flags).toEqual({
      GLOBAL: 'g',
      MULTI_LINE: 'm',
      INSENSITIVE: 'i',
      STICKY: 'y',
      UNICODE: 'u'
    })
  })
  test('capture/group', () => {
    expect(capture('test')).toEqual('(test)')
    expect(capture('')).toEqual('')
    expect(capture()).toEqual('')
    expect(capture('\\d+', 'number')).toEqual('(?<number>\\d+)')
    expect(capture('\\d+', {})).toEqual('(\\d+)')
    expect(group('test')).toEqual('(?:test)')
    expect(group()).toEqual('')
  })
  test('ALL', () => expect(matchers.ALL).toEqual('(.|\\s)'))
  test('Repeat', () => {
    expect(repeat('8')).toEqual('8')
    expect(repeat('8', 1)).toEqual('8{1}')
    expect(repeat('8', 1, 2)).toEqual('8{1,2}')
    expect(repeat('8', 1, Infinity)).toEqual('8{1,}')
  })
  test('Look ahead/behind', () => {
    expect(look.ahead('8')).toEqual('(?=8)')
    expect(look.ahead.positive('8')).toEqual('(?=8)')
    expect(look.ahead.negative('8')).toEqual('(?!8)')
    expect(look.behind('8')).toEqual('(?<=8)')
    expect(look.behind.positive('8')).toEqual('(?<=8)')
    expect(look.behind.negative('8')).toEqual('(?<!8)')
  })
})