Validate Regular Expression Syntax
Validate regular expression syntax instantly. Check for errors in your regex patterns before using them in code. Free online regex validator.
FAQ
My regex is valid but doesn't match what I expect. Why?
Valid syntax doesn't guarantee correct logic. Common issues: forgetting to anchor with ^ and $, greedy vs. lazy matching, not escaping special characters like . and (, or character class misunderstanding. Use our regex tester with test strings to debug.