Regex Code Generator
Free online regex code generator tool, no installation required
About Regex Code Generator
Turns a regular expression into ready-to-paste matching code for JavaScript, Python, Java, Go, or PHP. It validates the pattern with the chosen flags, optionally runs it against a test string to preview matches with their indexes and named groups, then emits idiomatic snippets using each language's native regex API.
How to Use
1. Enter the regex Pattern (without delimiters). 2. Set Flags - only g, i, m, s, u, y are accepted; other characters are stripped automatically. 3. Pick a target Language. 4. Optionally paste a Test String to preview matches. 5. Click Generate to view the live match results and the generated code; use Copy to grab it.
Per-Language Output
JavaScript: /pattern/flags literal plus matchAll when the g flag is set, otherwise str.match with named groups. Python: re.findall/re.finditer with flags mapped to re.IGNORECASE, re.MULTILINE, re.DOTALL, re.VERBOSE, re.ASCII. Java: Pattern.compile + Matcher.find loop. Go: regexp.MustCompile with FindAllString and FindAllStringSubmatchIndex. PHP: preg_match_all with PREG_SET_ORDER using /pattern/flags delimiters.
▶Why did I get an error message?
▶What happens without a test string?
▶Are Python regex flags translated?
▶Does it preserve named capture groups?
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