Regex & Validation
Test patterns and validate IDs and numbers. · ১৫ tools
Aadhaar Checksum ValidatorChecks whether a 12-digit Aadhaar-format number is mathematically self-consistent with the Verhoeff checksum, a format check only, not proof of real issuance.Credit Card ValidatorChecks a card number against the Luhn checksum and detects its likely network (Visa, Mastercard, Amex, Discover and more) from its prefix and length.Email Syntax ValidatorChecks an email address against practical RFC 5321/5322 syntax rules (length limits, dot placement, domain structure), not whether it actually receives mail.Glob Pattern TesterTests a glob pattern (as used in .gitignore, webpack configs, shell globbing) against a list of sample paths and shows which ones match.GSTIN ValidatorValidates an Indian GST Identification Number’s check character, decodes its state code and the embedded PAN, India-specific.IBAN ValidatorValidates an International Bank Account Number (IBAN) using its mod-97 checksum and checks the length against its country’s known IBAN standard.ISBN ValidatorValidates an ISBN-10 or ISBN-13 check digit and converts between the two formats.PAN ValidatorValidates the structural format of an Indian Permanent Account Number (AAAAA9999A) and decodes the holder’s entity type, India-specific.Phone Number ValidatorParses and validates an international phone number, showing its country, number type (mobile/landline) and standard formatted representations.Regex ExplainerBreaks any regular expression down into its parts, anchors, groups, character classes, quantifiers, with a plain-English explanation of each.Regex Pattern LibraryA searchable library of common, ready-to-copy regex patterns (email, URL, IP address, dates, passwords and more) with plain-English explanations.Regex TesterTest a JavaScript regular expression against sample text, with every match highlighted inline and capture groups listed.URL Parser & ValidatorParse any URL into its protocol, host, port, path, query parameters and hash using the browser’s own URL engine, with a plain breakdown of every part.UUID ValidatorValidates a UUID/GUID’s format and identifies its version (1-8) and variant from its standard bit layout.VIN DecoderValidates a 17-character VIN’s check digit and decodes its manufacturer region (WMI) and candidate model year(s) from position 10.
Test regular expressions with live match highlighting, learn from a library of common patterns, and validate formats such as emails, IBANs, ISBNs, credit card numbers, GSTIN and PAN using their official check-digit algorithms.
Validation confirms that a value is well-formed. It does not prove that an account, card or document actually exists.
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