Regular expression for JavaScript

var regPostcode = /^([a-zA-Z]){1}([0-9][0-9]|[0-9]|[a-zA-Z][0-9][a-zA-Z]|[a-zA-Z][0-9][0-9]|[a-zA-Z][0-9]){1}([ ])([0-9][a-zA-z][a-zA-z]){1}$/;

var result = regPostcode.test(SearchTerm);

if (!result) {
alert(“Please enter valid postcode”);
return false;
}

Regular expression for C#

string regPostcode = “([a-zA-Z]){1}([0-9][0-9]|[0-9]|[a-zA-Z][0-9][a-zA-Z]|[a-zA-Z][0-9][0-9]|[a-zA-Z][0-9]){1}([ ])([0-9][a-zA-z][a-zA-z]){1}”;

System.Text.RegularExpressions.Regex regx = new System.Text.RegularExpressions.Regex(regPostcode);

if(!regx.IsMatch(address0.PostalCode))
{
results.Add(new ValidationResult(String.Format(“Please enter valid postcode for {0}.”, addressRank)));
}

You can check the regular expression at http://www.regexplanet.com/

Postal code format and sample postcodes are as below.

Format Example
A9 9AA S1 1AA
A99 9AA M60 1NW
AA9 9AA CR2 6XH
AA99 9AA DN55 1PT
A9A 9AA W1A 1HQ
AA9A 9AA EC1M 1BB
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