On Mon, 27 Jan 2003 13:25:40 -0000, in gradwell.lists.cfdeveloper-dev
you wrote:
>We're doing a postcode lookup to autofill an address, but we need
>something to verify that a postcode is at least _syntactically_ valid if
>for some reason it's not in the PAF database.
/me notices that tim cannot be bothered to check out his email archive
for messages I sent him before:
This is the regexp used by the .UK domain registry for the postcode
check (in Perl notation):
/^[A-Z]{1,2}\d{1,2}[A-Z]? \d[A-Z]{2}$/
Admittedly this regexp would be more precise:
/^(?:(?:E1|EC[1-4]|SW1|W1|WC[12])[ABEHMNPRVWXY]|[A-Z]{1,2}\d{1,2})
\d[A-Z]{2}$/
. . . but only marginally so, and could cause problems if additional
postcodes become unexpectedly `subregioned'.
(Yes these regexps do miss out GIR 0AA and SAN TA1 but to date no one
has insisted upon using Girobank's processing centre or Santa Claus as
a contact.)
Apparently... full world post code syntax is given here:
http://www.magma.ca/~djcl/postcd.txt
According to that, the valid codes are given by:
United Kingdom
@# #@@ [postfix]
@#@ #@@ [postfix]
@## #@@ [postfix]
@@# #@@ [postfix]
@@@ #@@ [postfix]
@@## #@@ [postfix]
@@#@ #@@ [postfix]
@@@ #@@ [postfix]
another way of looking at the UK post code syntax is to say:
post-code = left SPACE right / "GIR 0AA" / "SAN TA1"
left = area district [sub-district]
area = LETTER [LETTER] ; 124 legal cases, listed on the page
; <http://www.davros.org/postcodes/ukformat.html>
; or the special cases "FX" (testing) and "AM" (Ambridge).
district = "0" / NONZERO [DIGIT]
sub-district = SLETTER ; only used in EC1-4, SW1, W1, WC1, and WC2
right = DIGIT RLETTER RLETTER
DIGIT = "0" / NONZERO
NONZERO = "1" / "2" / ... / "9"
LETTER = "A" / ... / "Z"
SLETTER = "A" / "B" / "E" / "H" / "M" / "N" / "P" / "R" /"V" / "W"
/ "X" / "Y"
RLETTER = "A" / "B" / "D" / "E" / "F" / "G" / "H" / "J" / "L" /
"N" / "P" / "Q" / "R" / "S" / "T" / "U" / "W" / "X" / "Y" / "Z"
peter
--
peter gradwell. gradwell dot com Ltd. http://www.gradwell.com/
engineering & hosting services for email, web and usenet
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