How to strip out letters from a string (e.g. XYZ321 --> 321)

Posted on 2004-03-25
Last Modified: 2008-02-26
Dear All,

Cans omebody provide me with a function that I can feed a string into (consisting of letters and numbers only), that strips out all the letters to return a number. i.e. so I can pass in XYZ321 or 321XYZ and it will pass out just 321.

Many thanks.

Question by:webtechy
LVL 12

Accepted Solution

venkateshwarr earned 200 total points
ID: 10680779
You can use a regular expression.

<script language="JavaScript">
     var x="SDASDAS123123xyu";
     x = x.replace(/[A-Za-z]/gi, '');
LVL 31

Assisted Solution

GwynforWeb earned 200 total points
ID: 10680794
function strip(val){
return val.replace(/[a-z]/gi,'')
LVL 18

Assisted Solution

bobbit31 earned 100 total points
ID: 10680803
<script language=javascript>
      function stripAlpha(str) {
            var retVal = "";
            for (i=0;i<str.length;i++) {
                  if (!isNaN(str.charAt(i))) {
                        retVal += str.charAt(i);
            return retVal;

Author Comment

ID: 10681938
Cheers guys :-)

All very valid answers ...

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