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Test, debug, explain, and highlight JavaScript regular expressions online. Real-time match indexing, group capture extraction ($1, $2, named groups), replace mode, code generator, and 100% browser-local data security.
No matches found for current regex pattern.
Type or paste your regular expression in the search bar and toggle regex flags (g global, i case-insensitive, m multiline, s dotAll) or pick a preset pattern.
Paste sample text to instantly view matching substrings, character index positions, and captured group values (numbered and named groups).
Switch to Replace mode for text substitution, view token explanations, or copy auto-generated regex code snippets in JavaScript, Python, Go, PHP, Java, or C#.
Zero server uploads. All regular expressions and test strings are evaluated locally inside browser memory.
Instantly highlights regex matches with match index positions, lengths, and captured group values ($1, $2, and named groups).
Breaks down regex patterns token-by-token explaining character classes, quantifiers, anchors, ranges, and lookarounds.
One-click access to tested regex patterns for Email, Phone, URL, IPv4, IPv6, Hex Color, Dates, HTML Tags, UUIDs, and Slugs.
Test pattern substitution with group replacement and generate clean code snippets for JS, Python, PHP, Go, Java, and C#.
Client-side safety limits prevent browser freeze or infinite loops during testing of complex nested patterns.
Our Regex Tester & Visualizer engine is open source under HiMat Technology. Star the repository, inspect the source, report issues, or contribute on GitHub.
Traditional web regex testers send sensitive backend logs, authorization headers, or database strings to remote servers. HiMat's Regex Tester operates strictly inside your web browser using native RegExp APIs. Zero network calls, zero tracking, total security.
No. The HiMat Regex Tester & Visualizer operates 100% locally inside your web browser. Neither your regex patterns, substitution rules, nor test text leave your device.
Our tool uses the native JavaScript RegExp engine supporting standard flags: global (g), case-insensitive (i), multiline (m), dotAll (s), unicode (u), and sticky (y).
Yes! Switch to Replace mode to test string replacement using `$1`, `$2`, or named group references like `$<name>`. Captures are highlighted in real-time.
Yes, 100% free with no account registration required, no usage caps, and zero advertisements.
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