Regex Tester & Converter
Test regular expressions, replace with regex, extract matches, and generate code snippets for 10 programming languages.
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How to Use This Tool
- Enter your regular expression pattern in the pattern field (between the slashes).
- Set regex flags (g=global, i=case-insensitive, m=multiline, s=dotAll, u=unicode).
- Switch between tabs: Test (highlight matches), Replace (search & replace), Extract (export matches as JSON/CSV/plain), and Code (generate snippets).
- In the Test tab, paste your text and see all matching results with positions.
- In the Replace tab, enter a replacement pattern and preview the result in real-time.
- In the Extract tab, export all matched text as JSON, CSV, or plain text format.
- In the Code tab, select your programming language to get ready-to-use regex code snippets.
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Frequently Asked Questions
What regex flavor does this tool use?
This tool uses JavaScript's RegExp engine, which is compatible with most modern programming languages. Code snippets are generated for 10 languages including JavaScript, Python, PHP, Java, Go, Rust, C#, Ruby, Swift, and TypeScript.
How do I use capture groups?
Wrap the parts of your pattern you want to capture in parentheses, like (\w+)@(\w+).com. The Extract tab will show you all captured groups, and in the Replace tab you can reference them with $1, $2, etc.
What export formats are supported?
The Extract tab supports three formats: JSON (structured data with match and index fields), CSV (spreadsheet-compatible), and plain text (one match per line).
Can I use this tool to learn regex?
Absolutely. The Test tab shows real-time results as you type, making it easy to experiment. The Code tab also provides working examples in your target language.
Is my data stored anywhere?
No. All processing happens entirely in your browser. Your text, patterns, and results are never sent to any server.
Does this tool support all regular expression features?
Our regex tester supports JavaScript regular expression syntax, including character classes, quantifiers, groups, lookaheads, lookbehinds, and flags like g, i, and m. It works in real-time as you type.