Regex Generator
Describe the text you want to match in plain English and get a tested-looking regular expression back, explained piece by piece with matching and non-matching examples.
How the regex generator works
Explain what the pattern should find, such as US phone numbers, dates in YYYY-MM-DD format or URLs without query strings, and name your programming language. The generator returns the regex, flags, a brief explanation of every token, sample strings that should and should not match, edge cases to watch, and a short code snippet. Replacement jobs include a reminder to preview changes before touching real files.
Tips for the best results
Paste several real examples of text that should match and a few that should not, because concrete samples beat descriptions. Name your flavor, since lookbehind and named groups differ between JavaScript and Python. Test the pattern in your editor or a regex tester before shipping. For bulk find-and-replace, commit your work or copy the files first so a bad match is easy to undo.
FAQ
Which regex flavors does it support?
JavaScript, Python, PCRE, Java, .NET and POSIX. Name your flavor and the syntax, flags and code snippet will match it. Without one, it uses PCRE-style syntax and notes differences.
Will the regex work on every input?
Regex has limits, especially for emails, HTML and nested structures. The tool lists edge cases and non-matching examples so you know where the pattern may fail. Always test on real data.
Can it explain a regex I already have?
Yes. Paste the pattern and ask for an explanation. It breaks it into tokens, describes each part, and can suggest a simpler or faster version.