Regex Tester Online
Test and debug regular expressions online with live match highlighting, group capture inspection, and flag toggles (g, i, m, s, u).
0 matches — runs entirely in your browser, nothing is uploaded.
ℹ️ Overview & Capabilities of Regex Tester
Toggle regex flags (global `g`, case-insensitive `i`, multiline `m`, dotAll `s`), view highlighted match positions, and inspect capture group arrays cleanly.
⚡ Key Features & Specifications
Visual match highlighting updates in real time as you type your pattern.
Easily toggle global (g), case-insensitive (i), multiline (m), and dotAll (s) flags.
Inspect captured sub-groups and match index positions in an organized table.
Alerts you to unescaped characters, unmatched parentheses, or invalid quantifiers immediately.
📖 Step-by-Step Guide: How to Use Regex Tester
Type your regular expression pattern in the pattern field (e.g. `[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}`).
Toggle global (g), case-insensitive (i), or multiline (m) flags to control matching behavior.
Paste sample test strings into the input area to view real-time matched highlights.
Inspect the match count and capture group details generated by the regex engine.