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Title |
Test
Details
UK Postcodes (tight and validated)
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Expression |
(?<O>(?<d>[BEGLMNS]|A[BL]|B[ABDHLNRST]|C[ABFHMORTVW]|D[ADEGHLNTY]|E[HNX]|F[KY]|G[LUY]|H[ADGPRSUX]|I[GMPV]|JE|K[ATWY]|L[ADELNSU]|M[EKL]|N[EGNPRW]|O[LX]|P[AEHLOR]|R[GHM]|S[AEGKL-PRSTWY]|T[ADFNQRSW]|UB|W[ADFNRSV]|YO|ZE)(?<a>\d\d?)|(?<d>E)(?<a>\dW)|(?<d>EC)(?<a>\d[AMNPRVY0])|(?<d>N)(?<a>\dP)|(?<d>NW)(?<a>\dW)|(?<d>SE)(?<a>\dP)|(?<d>SW)(?<a>\d[AEHPVWXY])|(?<d>W)(?<a>1[0-4A-DFGHJKSTUW])|(?<d>W)(?<a>[2-9])|(?<d>WC)(?<a>[12][ABEHNRVX]))\ (?<I>(?<s>\d)(?<u>[ABD-HJLNP-UW-Z]{2}))
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Description |
This is the tightest uk postcode validator I can come up with, I have copy of Royal Mail's PAF (Postal Address File) and I've confirmed that it will correctly validate all 1.75 million distinct postcodes.
I figure this regex will accept 54 million strings as valid, which gives a 30:1 false accept ratio, the best I can do.
I'll endeavour to keep it up to date with new post codes.
I've deliberately excluded special cases, These can be added as simple alternates.
2009-06-05 Improved: Replaced all numbered captured groups with 6 named capture groups (I Incode, O Outcode, d District, s Sector, a Area, u Unit) for separating postcode parts. Also removed begin (^) and end ($) positioning characters ST
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Matches |
CR0 1AA|EC50 1AA|SW1P 1AA|GU1 3AW
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Non-Matches |
DR1 1AA|EC51 1AA|sw1p 1aa|CR01AA|GIR 0AA|SAN TA1|BFPO 2|ASCN 1ZZ
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Author |
Rating:
Stephen Turner
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