Regex Tester & Replacer

Test regular expressions with real-time match highlighting, regex flags, replacement, and capture groups.

Regular Expression Pattern

/ /

Flags (g, i, m, s)

Test String Input

Matches Highlighted (0)

Regex Replace Utility

Replace With:

Replaced Result:

Interactive Regular Expression Tester & Debugger

Test and validate regular expressions in real time against arbitrary sample strings. Visualize matched tokens with clear highlight marks, count match occurrences, test replacement strings, and identify regex syntax errors instantly.

Frequently Asked Questions

Which regular expression engine is used for testing?

TinyTools uses the ECMAScript JavaScript RegExp engine built directly into your web browser, supporting standard flags like g (global), i (case-insensitive), and m (multiline).

Does the tool support regex find and replace?

Yes. Enter your substitution pattern into the "Replace With" field to instantly preview the transformed text alongside real-time match count statistics.

Are my test strings or patterns uploaded to any server?

No. All regular expression compilations, executions, and string replacements run 100% locally in your browser session.