Regex Tester

Common flags

• g — global; find all matches (default is just the first)
• i — case-insensitive
• m — multiline; ^ and $ match start/end of each line
• s — dotall; . matches newlines
• u — unicode
• y — sticky; only match from lastIndex

Engine

Uses your browser's native ECMAScript regex engine via new RegExp(pattern, flags). Supports lookbehinds (?<=…) in modern browsers. For PCRE-only features (recursion, named subroutines), use a server-side regex tool — JustKit can't help.

No tracking, no signup. Your pattern and test string never leave the browser.