Regex Tester & Validator

This regex matches a common UK postcode format: two uppercase letters, a digit, another letter, a space, then a digit and two more letters (e.g., SW1A 1AA). With the case-insensitive flag, it accepts lowercase variants, making it suitable for validating British postal codes in forms, address parsing, or data cleanup tasks. It is a simplified pattern that does not cover all valid postcode formats but works for many standard London and district codes.