Run results for: indexOf vs regex vs RegExp

Run details:

User agent: Mozilla/5.0 (Linux; Android 8.1.0; Moto G (5S) Plus) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.106 Mobile Safari/537.36 OPR/59.1.2926.54067

Browser: Opera Mobile 59

Operating system: Android 8.1.0

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
lowercase, trim, indexof	581201.2 Ops/sec
trim, lowercase, indexof	631025.5 Ops/sec
regex	1094910.0 Ops/sec
lowercase, replace, indexof	331106.3 Ops/sec
RegExp	276493.5 Ops/sec

Script Preparation code:

var str = "This is a simple test!";
var needle = "simple";
var ri = new RegExp('simple', 'i');

Tests:

lowercase, trim, indexof
var a = str.toLowerCase().trim(); var b = needle.toLowerCase().trim(); var c = a.indexOf(b) > -1;
trim, lowercase, indexof
var a = str.trim().toLowerCase(); var b = needle.trim().toLowerCase(); var c = a.indexOf(b) > -1;
regex
var c = /simple/i.test(str);
lowercase, replace, indexof
var a = str.toLowerCase().replace(" ", ""); var b = needle.toLowerCase().replace(" ", ""); var c = a.indexOf(b) > -1;
RegExp
var c = (new RegExp(needle, 'i')).test(str);

Run results for: indexOf vs regex vs RegExp

lowercase, trim, indexof

trim, lowercase, indexof

regex

lowercase, replace, indexof

RegExp