Run results for: regex vs substring compare

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_1_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.1.1 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.1.1

Device Platform: Mobile

Date tested: one year ago

substring

592.3M/s

regex

19.1M/s

View exact numbers

Test name	Executions per second
✓ substring	592,286,144 Ops/sec
regex	19,134,544 Ops/sec

Script Preparation code:

const link = "https://stats.nba.com";
const linkRegex = new RegExp(/^(http|www)/i);

Tests:

regex
const link = "https://stats.nba.com"; const linkRegex = new RegExp(/^(http|www)/i); if(link.match(linkRegex) !== null){}
substring
const link = "https://stats.nba.com"; const start = link.substring(0,3); if(start === 'htt' || start === 'www'){}