What JavaScript regex flags are supported?

You can test patterns with standard flags including `g` (global), `i` (case-insensitive), `m` (multiline), `s` (dotAll), and `u` (unicode).

Does this tool support capture groups and replacement?

Yes, it highlights matched text substrings, displays match indexes, lists capture groups, and allows live regex string replacement.

Syntax errors such as unclosed brackets `[` or invalid escape sequences `\` will be caught and displayed inline without crashing the tool.

Yes, your regex patterns and test strings are evaluated locally inside your browser's V8/JS engine.

100% Client-Side: Your data never leaves your browser. Zero server processing or data storage.

Enter a regex pattern, select flags, and type your test string. Matches are highlighted in real time with a capture groups table below.

Regex Pattern

/ /

Flags

g i m s u

Common Patterns

Test String

Matches: 0