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Posted By

adrianparr on 04/21/10


Tagged

regex format check String regexp validate postcode as3 uk


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AS3 Checks and Returns Valid UK Postcode using Regular Expression

 / Published in: ActionScript 3
 

URL: http://regexlib.com/REDetails.aspx?regexp_id=260

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  1. var inputPostcode:String = "dn3 6gb";
  2. trace("inputPostcode: "+inputPostcode);
  3. var checkedPostcode:String = validateUkPostcode(inputPostcode).toUpperCase();
  4.  
  5. if (checkedPostcode == "") {
  6. 	trace("No valid postcode was found");
  7. } else {
  8. 	trace("checkedPostcode: "+checkedPostcode);
  9. }
  10.  
  11.  
  12.  
  13. function validateUkPostcode(str:String):String {
  14. 	var returnString:String;
  15. 	var pattern:RegExp = /[a-zA-Z]{1,2}[1-9]{1}[0-9]?([ ]{1}[0-9]{1}[a-zA-Z]{2})/g;
  16. 	var result:Object = pattern.exec(str);
  17. 	if(result == null) {
  18. 		returnString = "";
  19. 	} else {
  20. 		returnString = result[0];
  21. 	}
  22. 	return returnString;
  23. }

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Posted By: adrianparr on May 14, 2010

NOTE: This is not a good regular expression to use to find matches of UK postcodes. For example, "EC1R 5DW" is an actual postcode, but this RegEx pattern does not find it! If anyone has a better RegEx pattern, please post it here.

Posted By: adrianparr on May 14, 2010

You can test your regular expression patterns here ...

http://gskinner.com/RegExr/

and

http://design215.com/toolbox/regexp.php

Posted By: adrianparr on May 14, 2010

The Wikipedia entry for 'Postcodes in the United Kingdom' (http://en.wikipedia.org/wiki/PostcodesintheUnitedKingdom) has the following Regular Expression, which seems pretty good ...

/[A-Z]{1,2}[0-9R][0-9A-Z]? [0-9][ABD-HJLNP-UW-Z]{2}/i

I have updated the snippet the use this new RegEx.

Posted By: adrianparr on May 14, 2010

http://en.wikipedia.org/wiki/UK_postcode

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