Question

i have regex code:

<script type="text/javascript">
     var str = "kw-xr55und";
     var patt1 = /[T|EE|EJU].*D/i;
     document.write(str.match(patt1));
</script>

it can read:

str= "KD-R55UND" -> as UND

but if i type:

 str= "kw-tc800h2und ->  result tc-800h2und.  //it makes script read T in front of 800
 i want the result as UND 

how to make the code just check at character behind the 800?

EDIT

After this code it can work:

<script type="text/javascript">
var str = "kw-tc800h2und";
var patt1 = /[EJTUG|]\D*D/i;
document.write(str.match(patt1));
</script>

but show next problem, i can show the result if:

str= "kw-tc800un2d"

i want result like -> UN2D

Answer 1

Try this:

 var patt1 = /(T|EE|EJU)\D*$/i;

It will match a sequence of non-digit characters starting with T, EE or EJU, and finishing at the end of the string. If the string has to end with D as in your examples, you can add that in:

 var patt1 = /(T|EE|EJU)\D*D$/i;

If you want to match it anywhere, not just at the end of the string, try this:

 var patt1 = /(T|EE|EJU)\D*D/i;

EDIT: Oops! No, of course that doesn’t work. I tried to guess what you meant by [T|EE|EJU], because it’s a character class that matches one of the characters E, J, T, U or | (equivalent to [EJTU|]), and I was sure that couldn’t be what you meant. But what the heck, try this:

 var patt1 = /[EJTU|]\D*D/i;

I still don’t understand what you’re trying to do, but sometimes trial and error is the only way to move ahead. At least I tested it this time! 😛

EDIT: Okay, so the match can contain digits, it just can’t start with one. Try this:

var patt1 = /[EJTU|]\w*D/i;