Run results for: Lowercase string comparison vs case insensitive regex test

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.4 Safari/605.1.15

Browser: Safari 18

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

lowercase string comparison

561K/s

case insensitive regex

212K/s

View exact numbers

Test name	Executions per second
✓ lowercase string comparison	561,169 Ops/sec
case insensitive regex	211,544 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

let items = [
  "iowefjoSVVawje",
  0,
  null,
  "iowefjeoSDVawje",
  "iowef34QETjoawje",
  "ioweffjoQWE765432awje",
  "iowefjrYY4eoawje",
  "ioweAfftree23456yuyjoawje",
  "iowefjA43oawje",
  "iowWfj2222oawje",
  "ioweTfj23462346oawje",
  "ioweEfj346234oawje",
  "ioweBfj234444oawje",
  "iowefjAo5689999awje",
  "Accept-Language",
  ];

Tests:

case insensitive regex
let regex = /Accept-Language|Cookie/i; for (let i = 0; i < items.length; i++){ let hasMatch = regex.test(items[i]); }
lowercase string comparison
let headerA = 'accept-language'; let headerB = 'cookie'; for (let i = 0; i < items.length; i++){ let lowercase = (items[i] || '').toLowerCase(); let hasMatch =lowercase=== headerA || lowercase === headerB; }