Regex Tester
0 Matches
/
/
How to use this regex tester
- Type your pattern and flags (like gmi).
- Paste or type test text.
- Matches highlight instantly, with a live match count.
What is a regular expression?
A regex is a pattern used to match character combinations in strings, widely used for validation, search-and-replace, and parsing text.
What do the flags g, m, and i mean?
"g" finds all matches instead of just the first, "i" makes matching case-insensitive, and "m" makes ^ and $ match the start/end of each line instead of the whole string.
Why does my pattern show an error?
This usually means invalid regex syntax — an unclosed bracket, an invalid escape sequence, or unbalanced parentheses are common causes.