Regex Checker

Use this regex checker to test patterns against code snippets, highlight every match, and review a rule-by-rule explanation of each rule.

This regex checker tests your regular expressions against real code and highlights matches as you type.

Regex pattern

Flags

Tip: You can also paste /pattern/flags into the regex field for quick checks.

Test text

const userName = "Ada Lovelace";
const repo = "RegexTools";

function greet(name) {
  return "Hello, " + name + "!";
}

Total matches

Flags