Regex Tester

What does this tool do?

A regular expression (regex) is a pattern for matching text. This tool evaluates a pattern against your text and lists every match, using the same regex engine as JavaScript — so what you see here is what you get in the browser or Node.js.

What you get

• Every match, not just the first. The global flag is applied for you, so the list shows all occurrences in the text.
• Whole matches only. Capture groups are not listed: (\w+)@(\w+) returns ana@example.com, not the separate ana and example.com. To inspect groups, run the same pattern in your own code.
• Flags: i (ignore case), m (multiline ^ and $), s (. matches newlines) and u (Unicode).

Keep in mind

Different languages have slightly different regex flavors. Results here reflect the JavaScript (ECMAScript) engine, which covers the vast majority of day-to-day patterns.

Matching happens as you type, so a pattern with catastrophic backtracking — ^(a+)+$ is the classic example — can freeze the tab on the wrong input. If the page stops responding, clear the pattern field and simplify the expression.