Regex Generator

Build regular expressions with a visual helper online for free. Common patterns for emails, URLs, phones, dates, and more. Test instantly.

Runs entirely in your browser — files never uploaded

//g

gGlobaliCase insensitivemMultilinesDotAll

Test String

.Any character (except newline)

\dDigit [0-9]

\wWord character [a-zA-Z0-9_]

\sWhitespace

^Start of string/line

$End of string/line

*0 or more

+1 or more

?0 or 1 (optional)

{n,m}Between n and m times

[abc]Character set

[^abc]Negated character set

(abc)Capture group

(?:abc)Non-capturing group

a|bAlternation (a or b)

(?=...)Positive lookahead

(?<=...)Positive lookbehind

How to use Regex Generator

1. Enter a pattern. Type a regular expression or pick one from the common patterns library.
2. Set flags. Toggle global, case-insensitive, multiline, or dotAll flags.
3. Test it. Paste your test string and see matches highlighted instantly with their positions.

What regex flavor is used?

JavaScript's built-in RegExp engine, which follows the ECMAScript specification.

Is my data sent to a server?

No. Everything runs entirely in your browser. Nothing leaves your machine.

Can I use look-behind assertions?

Yes, as long as your browser supports them. All modern browsers do.