Regex Playground

Type a regular expression pattern and test text. The tool instantly highlights all matches in real time as you type. You can also enter a replacement string to preview find-and-replace results. All processing runs in your browser.

The tool runs patterns using your browser's JavaScript regex engine (ES2020+), which supports lookahead, lookbehind, named capture groups, and Unicode property escapes. Python and PHP flavor notes are shown for syntax differences.

g (global) finds all matches. i (ignore case) makes matching case-insensitive. m (multiline) makes ^ and $ match line boundaries. s (dotAll) makes . match newlines. u (unicode) enables full Unicode support for \p{} and \u{} patterns.

Yes. Enter a replacement string and see the result of applying your regex with the replacement in real time. Supports backreferences ($1, $2) and named group references ($<name>) for powerful find-and-replace operations.

Yes. All regex matching and replacement runs entirely in your browser. Your patterns and test strings are never sent to any server — safe for testing patterns against sensitive data like logs, API responses, or configuration files.