Regex Tester & Visualizer

Test, debug, and visualize regular expressions client-side in real time. Live match highlighting, capture group extraction, flag toggles, and zero server transmission.

Live

Regex
Text

Regex Tester & Visualizer

Test, debug, and visualize regular expressions client-side in real time. Highlight pattern matches, inspect numbered & named capture groups, and toggle regex flags without sending your data to any server.

Preset Patterns

Regular Expression

Test String155 chars

2 matches0.25 ms

Contact support at help@elixuvo.com or reach out to dev.team@service.io for API inquiries. Invalid addresses like user@.com or @domain.com will be skipped.

🔒 100% Local Processing — Regular expressions are tested and executed entirely within your browser sandbox via native ECMAScript RegExp. Nothing is ever uploaded or logged.

Next Steps with this file

Continue directly into another tool without saving and re-uploading

1-Click Transfer • No re-upload required

How to use this tool

Enter your regular expression pattern into the Regex Input Bar (without enclosing forward slashes).
Toggle your desired regex flags: Global (g), Case Insensitive (i), Multiline (m), and DotAll (s).
Paste or type your sample test string into the input pane, or select from built-in preset patterns (Email, URL, Date, IPv4, UUID, Phone).
View live match highlighting directly in the text preview pane with alternating color accents.
Inspect the detailed Match Details and Capture Groups breakdown showing exact character indices and numbered ($1, $2) or named groups.
Click 'Copy Regex String' to copy the formatted pattern or 'Export Match Report (.txt)' to download a complete test summary.

Frequently asked questions

Quick answers about file privacy, processing modes, formats, and device support.

No. All regular expression parsing, execution, and visual highlighting are processed 100% client-side inside your browser sandbox. Your test strings, proprietary code, and regex patterns are never transmitted or logged.

This tool supports standard ECMAScript regular expression flags: 'g' (Global search for all matches), 'i' (Case insensitive matching), 'm' (Multiline matching for ^ and $), and 's' (DotAll, allowing '.' to match newline characters).

Whenever your regular expression contains capture parentheses (like (abc) or (?<name>xyz)), the tool inspects each match and displays numbered groups ($1, $2, etc.) as well as named groups with their exact extracted values.

Yes. The execution engine includes zero-width loop safeguards and match caps (up to 1,000 matches) to prevent browser freezes or runaway loops when testing greedy or nested quantifiers.

Yes. The Preset Patterns dropdown includes battle-tested regular expressions for emails, web URLs, IPv4 addresses, ISO dates, hex colors, phone numbers, and UUID v4 tokens that you can load with a single click.

You can click 'Copy Regex String' to copy the pattern with its selected flags in standard /pattern/flags literal notation, ready to paste directly into JavaScript, TypeScript, Python (re.compile), Go, or PHP.

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