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Matches UK postcodes according to the following rules 1. LN NLL eg N1 1AA 2. LLN NLL eg SW4 0QL 3. LNN NLL eg M23 4PJ 4. LLNN NLL eg WS14 0JT 5. LLNL NLL eg SW1N 4TB 6. LNL NLL eg W1C 8LQ Thanks to Simon Bell for informing me of LNL NLL rule for postcodes which I had omitted in an earlier version.

This regular expression can be used to validate UK postcodes. Especially useful if want to provide a client side validation on a web site.

Checks whether the string specified is in the same format as the UK postcode format defined on: http://www.magma.ca/~djcl/postcd.txt It allows: A = Letter N = Number AN NAA, ANA NAA, ANN NAA, AAN NAA, AAA NAA (rare), AANN NAA, AANA NAA It gives the option to have the two parts of the uk postcode to be separated by a space or a hyphen. (restriction is set to all-capitals)

Matches UK postcodes according to the following rules 1. LN NLL eg N1 1AA 2. LLN NLL eg SW4 0QL 3. LNN NLL eg M23 4PJ 4. LLNN NLL eg WS14 0JT 5. LLNL NLL eg SW1N 4TB 6. LNL NLL eg W1C 8LQ. Modifications: 1) Doesn't allow leading zeros in first part (outward) eg BT01 3RT is incorrect; it should be BT1 3RT. 2) Only allows uppercase letters, which is the preference of the UK Post Office. 3) Permits the only postcode to break the rules - GIR 0AA (for the old Girobank, now Alliance & Leicester bank, address)

Regular expression to match valid UK postcodes. In the UK postal system not all letters are used in all positions (the same with vehicle registration plates) and there are various rules to govern this. This regex takes into account those rules. Details of the rules: First half of postcode Valid formats [A-Z][A-Z][0-9][A-Z] [A-Z][A-Z][0-9][0-9] [A-Z][0-9][0-9] [A-Z][A-Z][0-9] [A-Z][A-Z][A-Z] [A-Z][0-9][A-Z] [A-Z][0-9] Exceptions Position - First. Contraint - QVX not used Position - Second. Contraint - IJZ not used except in GIR 0AA Position - Third. Constraint - AEHMNPRTVXY only used Position - Forth. Contraint - ABEHMNPRVWXY Second half of postcode Valid formats [0-9][A-Z][A-Z] Exceptions Position - Second and Third. Contraint - CIKMOV not used

Validates UK postcodes and aligns in parenthesized subpatterns according to standard UK postcode elements. Validation is according to guidelines outlined at http://www.govtalk.gov.uk/gdsc/html/noframes/PostCode-2-1-Release.htm Postcode elements are separated according to description at http://www.graticule.com/data/uk/pcdata.html Expression is not thoroughly tested, but seems to be doing ok so far! Comments and improvements welcome.

Matches UK postcodes of the below formats. The space is optional. AN NAA AAN NAA ANN NAA ANA NAA AANA NAA AANN NAA

Here it is, the monster UK Postcode regular expression that should prevent the majority of miskeying. Unlike an most other regexes it only permits valid combinations of letters, e.g. BN works, BM does not. Spaces between the first and second parts are optional. I have tested this against a file of 7,500 valid postcodes, and also against a real-world list of about 12,000 which had some bad data. Manually checking a sample of the rejected ones showed it was working correctly (and how poor the data was!!). I originally started by trying to adapt the GDSC document at http://www.govtalk.gov.uk/gdsc/html/frames/PostCode.htm and specifically their XSD pattern at http://www.govtalk.gov.uk/gdsc/schemaHtml/bs7666-v2-0-xsd-PostCodeType.htm but this turned out to be rather loose. Instead I wrote this. If you find any valid postcodes being rejected by this regex please let me know.

For the terminally hard of thinking, a version of my UK postcode validator without WHITESPACE. Unlike most validators on regexlib, this knows valid postcode combinations, e.g. W1A is permitted, W1 is not, but W2 is. It should catch between 95-98% of invalid postcodes.

matches uk postcodes according to specifications found at: http://www.govtalk.gov.uk/gdsc/html/noframes/PostCode-2-1-Release.htm

This regex have been created as per the information provided on http://www.govtalk.gov.uk/gdsc/html/noframes/PostCode-2-1-Release.htm. This expression will allow the postcodes with space or without space.

Validates a complete UK postcode. Returns the two halves in sub-expressions. Supports the following 7 formats: A1 1AA, A11 1AA, A1A 1AA, AA1 1AA, AA11 1AA, AA1A 1AA GIR 0AA (** And the same 7 formats without the space are also accepted). (requires postcodes to be upper-case)

This is my combination of other UK postcode examples to date in this library. This is similar to Howard Richards’s solution in that it only permits valid combinations of letters, e.g. BN works, BM does not. The space(s) are optional, and the string to match does not have to be in an upper or lower case. On top of that this allows BFPO (http://www.bfpo.mod.uk/bfponumbers_ships.htm) and Overseas Territories Postcodes (http://en.wikipedia.org/wiki/UK_postcodes) Please let me know if you have any suggetion to improve this!

This is my combination of other UK postcode examples to date in this library. This is similar to Howard Richards’s solution in that it only permits valid combinations of letters, e.g. BN works, BM does not. The space(s) are optional, the string to match should be in upper case. On top of that, this solution allows BFPO (http://www.bfpo.mod.uk/bfponumbers_ships.htm) and Overseas Territories Postcodes (http://en.wikipedia.org/wiki/UK_postcodes) Please let me know if you have any suggetion to improve this!

This regex matches all valid, current UK Postcodes, including Girobank and non-geographic postcodes, irrespective of whether they contain a space. It does not include overseas territories. Adapted from the BS7666 postcode rules at: http://www.cabinetoffice.gov.uk/govtalk/schemasstandards/e-gif/datastandards/address/postcode.aspx

Matches the first part of a UK Postcode (known as a postcode district). Case insensitive. Doesnt match: GIR # the postcode for the formerly Post Office-owned Girobank is GIR 0AA. SAN # the postcode for correctly addressed letters to Father Christmas is SAN TA1

I used this in C#.NET to check the validity of UK postcode entries. It successfully matches all acceptable formats (with or without a space) but does not check that the actual postcode is valid due to constant changes. Hope this helps - Jon NOTE: If you are not using in .NET yoy may need to replace \d with [0-9], \A with ^, and \Z with $.

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

Validates all UK Postcodes based on format given at cabinetoffice.uk.gov. Must be in uppercase before validation.

The postcode district is the first block of a UK postcode. For example with DN55 1PT it would match DN55. Its a loose match as it only ensures that the format is correct, it doesn't validate the letters and numbers. It doesn't let in the non-geographic codes postcodes SAN TA1 and GIR 0AA. It will pull out the first block of any of the matching examples below. Examples of the names of the different parts of a UK postcode can be found here: http://en.wikipedia.org/wiki/Postcodes_in_the_United_Kingdom#Life-cycle_of_post_codes