Regular Expressions Tools
Regular expression reference and tools: metacharacters, character classes, anchors, quantifiers, groups and lookarounds explained, with greedy versus lazy.
正则表达式速查表 (Regular Expressions) is a frequently consulted reference for developers. Keeping the reference and ready-to-use tools on one page cuts the cost of switching back and forth. All tools below run locally, are free, and need no sign-up.
Related Tools
- 🔍Regex TesterTest JavaScript regular expressions with flags like g, i, m, s and u plus capture groups, listing every match and named group as you type. All hits listed.
- 📒Regex CheatsheetQuick reference for JS regex syntax, character classes, anchors, quantifiers and lookarounds, a handy cheat sheet for writing and debugging match patterns.
- 🔄Text ReplacerFind and replace text with case-sensitive, whole-word and regex matching. Replace all at once with live preview, and review every hit before applying.
- 📧Email ExtractorExtract all email addresses from any text, validate the format and remove duplicates. Works on pasted page source and contact lists, ready to export in one.