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Developer Tools/Regex
Choose a feature below. Every tool runs on your device — no uploads required.
Open full regex studioTest regular expressions in real-time with live highlighting, match groups, pattern library, and regex cheat sheet. 100% browser-based, zero tracking.
Use regular expressions to find and replace text patterns. Support for capture groups, backreferences, and flags.
Debug your regular expressions step-by-step. Visualize matching process and identify issues in complex patterns.
Check regex pattern compatibility across JavaScript, Python, Java, and Go flavors. Avoid cross-platform bugs.
Analyze regular expressions for catastrophic backtracking vulnerabilities (ReDoS). Protect your app from regex denial-of-service.
Extract structured data from text using regex capture groups. Export matches as CSV or JSON.
Browse and copy common regex patterns for emails, URLs, phone numbers, dates, IPs, and more. Ready-to-use templates.
Regex syntax reference with examples. Anchors, quantifiers, groups, lookaheads, character classes, and more.
Use advanced regex debugging with backtracking risk analysis, compatibility checks, extraction previews, and test-case driven validation.