Run results for: charAt(i) vs RegExp

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.135 Safari/537.36

Browser: Chrome 84

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
charAt()	3369921.5 Ops/sec
RegExp	2795986.8 Ops/sec

Tests:

charAt()
let pStringDate = '2000-10-07T11:00:34'; let noop = Function.prototype; if (pStringDate.charAt(4) === '-' && pStringDate.charAt(7) === '-' && pStringDate.charAt(10) === 'T' && pStringDate.charAt(13) === ':' && pStringDate.charAt(16) === ':') noop();
RegExp
let pStringDate = '2000-10-07T11:00:34'; let noop = Function.prototype; const pattern = /'(\d{4}-[01]\d-[0-3]\dT[0-2]\d:[0-5]\d:[0-5]\d\.\d+)|(\d{4}-[01]\d-[0-3]\dT[0-2]\d:[0-5]\d:[0-5]\d)|(\d{4}-[01]\d-[0-3]\dT[0-2]\d:[0-5]\d)/g; if (pattern.test(pStringDate)) noop();