Regex Tester

Test and debug regular expressions in real time. See match count, captured groups, and flags highlighted instantly. JavaScript regex syntax.

Pattern

/ /

g i m s

Test String

How to Use

1 Enter your regular expression pattern in the Pattern field
2 Select optional flags: g (global), i (case-insensitive), m (multiline), s (dotAll)
3 Type or paste your test string in the input area
4 Click Test to see all matches and captured groups

Form Validation

Test email, phone, or URL validation patterns before embedding them in your application code.

Log Parsing

Develop patterns to extract specific fields from server logs or structured text data.

Learning Regex

Experiment with regex syntax and immediately see how patterns match or fail on different inputs.

What regex flavor does this tool use?

This tool uses JavaScript ECMAScript regex syntax, which is compatible with web browsers, Node.js, and most modern JavaScript runtimes.

What do the flags do?

g (global) finds all matches; i ignores case; m makes ^ and $ match line boundaries; s makes . match newline characters too.

Why is my pattern not matching?

Common issues include forgetting to escape special characters like . * + ? ^ $ { } [ ] | ( ) or using the wrong flag for case or multiline matching.