Regular Expression Tester
The hardest part of writing regex is not seeing what it matches. This tool live-highlights every match, lists each capture group (including named groups), supports all g/i/m/s/u/y flags, and previews replacements (with $1, $&). Syntax errors are flagged instantly and never hang.
It runs locally with your browser's native regex engine, never uploaded — regexes often hold internal IPs, log samples and user data. Filtering logs, cleaning IP ranges, extracting domains / emails: all regex underneath.
//g
Test string
Matches: 3
访问来自 8.8.8.8 与 192.168.1.1，回源 1.1.1.1，端口 443。
Replace (optional, supports $1 $& )
Local, browser-native engine, never uploaded — regexes often hold internal IPs and log samples. Filtering logs, cleaning IP ranges, extracting domains: all regex underneath.
Check your exit IP's purity while you're here →