I'm trying to set up data validation so as to validate the 1st part of an entered postcode

The 1st part of Postcodes in the UK is in the format:

X9
XX9
XX99

X represents a character from A-Z
9 represents a number from 0-9

Has anyone any idea how I could achieve this using the Spry Validation text field on a form?

I've been looking into this and the only thing I think I can do is to modify the spryvalidationtextfield.js file.

The section I think I need to modify is:

'zip_uk': {
characterMasking: /[\dA-Z\s]/,
validation: function(value, options) {
//check one of the following masks
// AN NAA, ANA NAA, ANN NAA, AAN NAA, AANA NAA, AANN NAA
return /^[A-Z]{1,2}\d[\dA-Z]?\s?\d[A-Z]{2}$/.test(value);
}

Does anyone know what the characters do?

I'm guessing [A-Z]{1,2} tells it to expect characters from A-Z of either 1 or 2 character length?
but what do the \d and \s and the question marks and the $ symbol all mean?<u></u><u></u><u></u><u></u><u></u><u></u>

Edited by - DAKNIGHTUK on 04 Jan 2008 13:28:51

I found a website www.webdevelopersjournal.com/articles/jscript_forms2.html which explains what the characters all mean my resultant edited spryvalidationtextfield.js looks like this :

'zip_uk': {
characterMasking: /[\dA-Z\s]/,
validation: function(value, options) {
//check one of the following masks
// AN NAA, ANA NAA, ANN NAA, AAN NAA, AANA NAA, AANN NAA
return /^[A-Z]{1,2}\d{1,2}$/.test(value);
}

I changed the line:

return /^<b>[a-zA-Z]</b>{1,2}\d{1,2}$/.test(value);

to allow the user to input upper or lower case.

The purpose of the spry validation was to limit what the user could enter and block any possiblity of an sql injection attack by not allowing symbol characters