Regex Editor & Tester

Validates UK postcodes per the official Royal Mail format, supporting both spaced (SW1A 1AA) and compact (SW1A1AA) variants. It handles the special Girobank postcode GIR 0AA and enforces position-specific letter rules, such as excluding Q and V from the first character and C, I, K, M, O, V from the final two letters of the inward code. With gmi flags, it matches postcodes case-insensitively throughout multiline text, making it ideal for address form validation, e-commerce checkout, and address data extraction.