Yes. All 42 tools are 100% free with no signup, no ads in your face, and no hidden limits. The core tools will always be free.

Do AHX tools upload my data to a server?

No. Every tool runs entirely in your browser using JavaScript. Your data never leaves your device.

Can I use AHX offline?

Yes. Once the page has loaded, every tool works without an internet connection. AHX is installable as a PWA.

Is Regex Tester free?

Yes. Regex Tester is 100% free with no signup and no usage limits.

Does Regex Tester upload my data?

No. Regex Tester runs entirely in your browser. Your data never leaves your device.

Do I need to install anything?

No. Regex Tester works in any modern web browser. Just visit the page and start using it.

AHX

Regex Tester

Test regular expressions with live match highlighting.

Pattern

Flags

Quick:

Test string

Match preview

Hello 123 world 456 foo 789

0 matches found

Regex cheat sheet

. (dot)Any character

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

\dDigit [0-9]

\sWhitespace

\W \D \SOpposite of above

[abc]Any of a, b, c

[^abc]NOT a, b, c

[a-z]Range a to z

^Start of string

$End of string

\bWord boundary

*0 or more

+1 or more

?0 or 1 (optional)

{n}Exactly n

{n,m}n to m

(abc)Capture group

(?:abc)Non-capturing

a|ba OR b

(?<name>)Named group

Runs entirely in your browser. No data leaves your device.

About Regex Tester

Test regular expressions in real-time with match highlighting, capture group extraction, and support for global, case-insensitive, and multiline flags. Perfect for developers debugging patterns, validating input formats, or learning regex syntax.

Common use cases

Test a regex pattern before using it in code
Debug a pattern that should match but does not
Extract capture groups from test strings
Validate email, phone, or URL formats
Learn regex syntax with instant feedback

JetBrains — regex assistance built in

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WebStorm explains regex inline, suggests simplifications, and flags catastrophic backtracking — no copy-paste needed.

jetbrains.com

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