Run results for: regex vs RegExp vs indexof vs indexOf and substr

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.88 Safari/537.36

Browser: Chrome 100

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
regEx	449.3 Ops/sec
RegExp	458.1 Ops/sec
indexof and substr	176.8 Ops/sec
indexOf	893.3 Ops/sec

HTML Preparation code:

<div></div>

Script Preparation code:

window.regex = /^test/;
window.regexp = new RegExp(/^test/);
window.match = 'test';
var data = window.data = [];
const possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
var TOTAL_STRINGS = window.TOTAL_STRINGS = 100000;

function getRandomInt(max) {
  return Math.floor(Math.random() * max);
}

function makeRandomString(len) {
  var text = "";
  for( var i=0; i < len; i++ ) {
    text += possible.charAt(getRandomInt(possible.length));
  }
  return text;
}

while (data.length < TOTAL_STRINGS) {
  data.push(makeRandomString(getRandomInt(20)));
}

Tests:

regEx
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var regex = window.regex; while (x < TOTAL_STRINGS) { const str = data[x]; regex.test(str); x += 1; }
RegExp
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var regexp = window.regexp; while (x < TOTAL_STRINGS) { const str = data[x]; regexp.test(str); x += 1; }
indexof and substr
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var match = window.match; while (x < TOTAL_STRINGS) { const str = data[x]; const posAt = str.indexOf(match); str.substr(posAt, 1); x += 1; }
indexOf
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = window.data; var match = window.match; while (x < TOTAL_STRINGS) { const str = data[x]; str.indexOf(match) === 0; x += 1; }

Run results for: regex vs RegExp vs indexof vs indexOf and substr

regEx

RegExp

indexof and substr

indexOf