Complete regex tool: test patterns with visual highlighting, generate regex from categories, explain token by token, validate formats, extract data, replace with presets, and generate code for 7 languages — all 100% local in the browser using the JavaScript engine.
🔒 100% local in the browser. Uses JavaScript regex engine.
| # | Match | Position | Line:Col | Groups | |
|---|---|---|---|---|---|
| 1 | (vazio) | 0–0 | 1:1 | — |
The tester shows matches with alternating colors, position (line and column), captured groups and execution time. You can export results as JSON, CSV or TXT.
The replacement field lets you test substitutions with a before/after preview and occurrence count.
Choose what you want to find (email, phone, date, URL, UUID, etc.) and configure specific options. The regex is generated automatically with explanation and test text.
The visual builder lets you compose regex by clicking blocks: characters, anchors, quantifiers, groups, sets, lookaround and escape.
The explainer analyzes the regex token by token in plain language, making it easier to learn and debug complex patterns.
Over 30 ready patterns organized by category. Validation mode checks format compliance. Extraction mode finds all items in large texts. Replacement presets include removing spaces, HTML, emojis, masking data and normalization.
Generate ready-to-use code in JavaScript, TypeScript, Python, PHP, Java, C# and Go for test, extract and replace modes.
Diagnostics shows a checklist and suggestions to improve your regex.
All processing is local in the browser. No text or regex is sent to any server.
This tool uses the JavaScript (ECMAScript) regex engine. Some features like lookbehind may not work in older browsers.
Regex (regular expression) is a search pattern used to find, validate and replace text. Widely used in programming, text editors and search tools.
It uses the native JavaScript (ECMAScript) regex engine of your browser.
Yes. In the Generate tab, choose a category and configure options. The regex is generated with explanation and test text.
Most basic patterns work across engines. The Code tab generates adapted snippets, but always review for engine-specific differences.
Use ^ (start) and $ (end) anchors around your pattern.
In the Extract tab, paste text and choose the type. Results can be exported as JSON, CSV or TXT.
No. All processing is 100% local in the browser.
Helpful links to continue similar tasks without starting over.
Online Character and Word Counter
Count characters, words, lines, sentences, paragraphs, emojis, and limits for SEO, social media, writing, and coding.
JSON Formatter and Minifier
Format, minify, and validate JSON for free, with no sign-up, no login, readable error feedback, and quick copy actions.
URL Encoder and Decoder
Encode and decode URLs and query params with support for special characters and fast copy actions.
Remove Accents from Text
Remove accents and special characters for URLs, filenames, spreadsheets, and normalized identifiers.
Tools on this page run directly in your browser and do not send entered content to a backend. This improves privacy and reduces latency.
