Regex Tester

What is a Regex Tester?

A Regex Tester applies a regular expression to your text and shows the result live while you type. Matched pieces are highlighted, a match counter updates on every keystroke, and invalid patterns explain their error instead of failing silently.

Which flags are supported?

• g — global: find all matches instead of just the first.
• i — ignore case: a matches both a and A.
• m — multiline: ^ and $ match line starts and ends.
• s — dot-all: . also matches newline characters.
• u — unicode: enables unicode-aware escapes such as \p{...}.

How do I anchor my pattern?

Use ^ to anchor to the start of the text and $ to the end. Without anchors a pattern matches anywhere in the text. Add \b word boundaries for whole-word matching and use parentheses to capture groups you want to reuse.

Is my data safe?

Yes. Matching runs entirely on your device; your pattern and test text never leave the browser. Log lines, tokens or code samples can be tested here safely.