Why Use This? Regular expressions (Regex) are used in web apps to validate inputs like GSTIN, PAN, Phone, Email, and URLs. Writing them by hand is error-prone. This tool lets you build regex visually and test them live.
1️⃣ Pick a Preset: Select Email, Phone, GSTIN, PAN, or URL to load valid rules.
2️⃣ Test Live Inputs: Type sample data below to see green MATCH or red FAIL badges.
3️⃣ Copy to Codebase: Click Copy Regex to paste the pattern into your JavaScript, Python, or backend code.