MeasureThat.net

Run results for: regexp n such

testing the performance of a broad regexp vs a series of more specific regexps

Go to the benchmark
Run details:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36
Chrome 53
Mac OS X 10.11.6
Other
8 years ago
Test name Executions per second
regexp 597486.0 Ops/sec
many regexps 308116.1 Ops/sec
Script Preparation code:
AخA
 
var strings = [
  'bbbb',
  'AAbb',
  'aaBB',
  'AAbb11',
  'aaBB11',
  '11aaBB',
  'aaAAbb',
  'aaaa'
];
Tests:

  • regexp

     
    const matches = strings.filter(s => /^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d$@!%*#?&-_]{4,14}$/.test(s));
    if (matches.length !== 3) {
      throw 'invalid number of matches: ' + matches;
    }

  • many regexps

     
    const matches = strings.filter(s => {
      return /^[\w$@!%*#?&-]{4,14}$/.test(s) &&
             /[A-Z]/.test(s) &&
             /[a-z]/.test(s) &&
             /[0-9]/.test(s);
    });
    if (matches.length !== 3) {
      throw 'invalid number of matches: ' + matches;
    }