regex

Find and Replace — Replace any pattern in your text — exact match or regex, case-sensitive or not. Runs entirely client-side inside your browser.

Filter Lines by Substring — Drop every line that contains a pattern — or keep only the lines that do. Plain substring matching or full regex.

Regex Tester — Test JavaScript regular expressions live — see matches highlighted in your text and captured groups in a list.

Regex Explainer — Deconstruct regular expressions. Analyze quantifiers, capture groups, sets, boundaries, and flags with clear explanations.

Free online SQL regex tester. Test REGEXP patterns across MySQL, PostgreSQL, SQLite, and MSSQL dialects. See matches and differences instantly.

Free online regex visualizer. Create visual diagrams and flowcharts of regular expression patterns. Understand complex regex at a glance.

Free online regex to code converter. Convert regular expressions to JavaScript, Python, Go, Rust, Java, and C# code with proper escaping.

Free interactive regex cheat sheet. Quick reference for regular expression syntax with live examples. Covers character classes, quantifiers, and more.

Free online regex explainer. Understand regular expression patterns with plain English explanations. Break down complex regex step by step.

Free online regex batch tester. Test regular expressions against multiple strings simultaneously. See matches, groups, and highlights.

Free online regex to English converter. Convert regular expression patterns to human-readable descriptions. Perfect for documentation.

Free online string to regex generator. Generate regular expression patterns from example strings. Detect common patterns automatically.

Free visual regex builder. Compose regular expressions from categorized tokens, test live with highlighting, and get plain-English explanations.

Free online phone number extractor. Extract phone numbers from text with support for international and US formats. Normalize to E.164, deduplicate, and count results. Client-side only.

Free online line filter. Extract only the lines that match your pattern -- contains, starts with, ends with, or regex. Case-sensitive toggle and match count. Client-side only.