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@rob-murray

rob-murray/UK Company Number regex

Last active February 4, 2024 02:12
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A regex to check UK Company numbers - ie the reference assigned to companies in the UK via Companies House
Raw
UK Company Number regex
/^((AC|ZC|FC|GE|LP|OC|SE|SA|SZ|SF|GS|SL|SO|SC|ES|NA|NZ|NF|GN|NL|NC|R0|NI|EN|\d{2}|SG|FE)\d{5}(\d|C|R))|((RS|SO)\d{3}(\d{3}|\d{2}[WSRCZF]|\d(FI|RS|SA|IP|US|EN|AS)|CUS))|((NI|SL)\d{5}[\dA])|(OC(([\dP]{5}[CWERTB])|([\dP]{4}(OC|CU))))$/
@mrbrianevans
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Had another go at it:

/^(((AC|CE|CS|FC|FE|GE|GS|IC|LP|NC|NF|NI|NL|NO|NP|OC|OE|PC|R0|RC|SA|SC|SE|SF|SG|SI|SL|SO|SR|SZ|ZC|\d{2})\d{6})|((IP|SP|RS)[A-Z\d]{6})|(SL\d{5}[\dA]))$/;

The rules around registered societies (starting with IP|SP|RS prefix) could probably be tightened up, this is a more permissive regex, matches all the company numbers in the bulk CSV file.

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