Run results for: regex v split parsez

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 10 months ago

Test name	Executions per second
split	5962340.0 Ops/sec
rgx	2591171.0 Ops/sec

Script Preparation code:

var strs = [
  "tag:cool",
  "a8798d75-18ed-473b-a28b-0b756dd99151",
  "asdf",
  "othertag:",
  "asdf:qwer:test",
  ":hmm",
  ":",
]

Tests:

split
function doSplit(str) { const parts = str.split(':') if (parts.length !== 2) { return null } return parts[0] } for (const str of strs) { doSplit(str) }
rgx
const rgx = /(?<tag>[a-z]+):(.*)?/ function doRgx(str) { const res = str.match(rgx) if (!res) { return null } return res.groups?.tag ?? null } for (const str of strs) { doRgx(str) }