> I agree, a straight look up would be more accurate. Perhaps
> there's a web service to check post codes.
there is - postcodeanywehere.co.uk
you can even get a dev account off them to test the service and I found them
quite helpful. Here's an example of how easy it is to check:
<cfscript>
service ="http://services.postcodeanywhere.co.uk/uk/lookup.asmx?wsdl";;
account = "XXXXXXXXX";
license = "XXXX-XXXX-XXXX-XXXX";
postcode = "BH4 9HH";
</cfscript>
<cfinvoke method="ByPostcode" returnvariable="test"
webservice="http://services.postcodeanywhere.co.uk/lookup.asmx?wsdl";>
<CFINVOKEARGUMENT NAME="postcode" VALUE="#postcode#"/>
<CFINVOKEARGUMENT NAME="accountcode" VALUE="#account#"/>
<CFINVOKEARGUMENT NAME="licensekey" VALUE="#license#"/>
</cfinvoke>
> -----Original Message-----
> From: Douglas Humphris [mailto:[EMAIL PROTECTED]]
> Sent: 27 January 2003 13:20
> To: [EMAIL PROTECTED]
> Subject: RE: [ cf-dev ] Postcode validation
>
>
> As I say, a first stab to get the ball rolling. Tim asked for
> a PC validator: is that to validate that the Post Code
> actually exists, or validate it's structure so that it could
> possibly exist? You can't assume that the user enters in
> upper case, unless you force it before validating.
>
Perhaps, though,
> this is overkill for what Tim is wanting here.
>
> Douglas
>
> -----Original Message-----
> From: Paul Johnston [mailto:[EMAIL PROTECTED]]
> Sent: 27 January 2003 13:03
> To: [EMAIL PROTECTED]
> Subject: RE: [ cf-dev ] Postcode validation
>
>
> Hmmm... Regex:
>
> >
> > This is a first stab at one...
> >
> > RegEx = ^[a-zA-Z]{1,2}[1-9]{1,2}[ ]{1}[1-9]{1,2}[a-zA-Z]{1,2}&
>
> Wouldn't work for something like
>
> SW1P
>
> Which is a Westminster postcode
>
> Adding this in it is slightly more complicated (and therefore
> more easy to
> hack), Postcodes are always upper case too:
>
> RegEx = ^[A-Z]{1,2}[1-9][0-9A-Z]?[ ]{1}[1-9]{1,2}[A-Z]{1,2}&
>
> Unfortunately, this also equals:
>
> XX1X which is definitely not a postcode
>
> Goes back to my original statement that you need to actually
> have a list of
> postcodes to test against, which means buying the postcode
> database from the
> Royal Mail.
>
> The only way to really make a postcode that isn't going to be
> hackable is to
> have all of the postcodes! It's not a string that can be
> simply tested with
> a regular expression (although it can be verified as a
> POSSIBLE postcode)
>
> Paul
>
>
>
>
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