Solved

how to extract numbers from string using Javascript?

Posted on 2013-11-14
2
359 Views
Last Modified: 2013-11-14
how to extract numbers from string using Javascript?
Test cases below:
string s = 1AA11111
string s1= 2111CA2

string s result  = 111111
string s1 result = 211112

My code below is not working:
var j = 0;
var startPlateNums = "";
while (j <= iStartLength && !isNaN(iStartNumber.substring(j, j + 1)))
 {
          startPlateNums = startPlateNums + iStartNumber.substring(j, j + 1);
           j++;
 }
0
Comment
Question by:Meinhoonaa
2 Comments
 
LVL 5

Accepted Solution

by:
Dontmilkthis earned 500 total points
ID: 39649608
So here's a quick function I made that extracts the numbers.

main difference is the while loop you had, was breaking out as soon as it hit a number, ie the first character in your test strings. so it was never executing the code in the loop.




function getNumbers(string)
{
      var iStartLength = string.length;
      var startPlateNums = "";
      var j = 0;
      var startPlateNums = "";
      while (j <= iStartLength)
       {
             if(!isNaN(string.charAt(j)))
             {
                startPlateNums = startPlateNums + string.charAt(j);
          }
                 j++;
       }
       return startPlateNums;
}


or a bit cleaner with a for loop

function getNumbers(string)
{
      var startPlateNums = "";
      for (var j=0; j <= string.length; j++)
       {
             if(!isNaN(string.charAt(j)))
             {
                startPlateNums = startPlateNums + string.charAt(j);
          }
       }
       return startPlateNums;
}
0
 
LVL 44

Expert Comment

by:Rainer Jeschor
ID: 39649722
Hi,
or this simple regular expression:
function ExtractNumbers(stringToBeProcessed) {
    return stringToBeProcessed.replace(/\D/g, '');

}

Open in new window


Sample:
http://jsfiddle.net/EE_RainerJ/3FyXJ/

HTH
Rainer
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Today I would like to talk about localizing (Internationalization) JavaScript applications. Introduction When creating an application that is going to be used by many people around the globe, it is important to remember that not everyone speak…
I've been trying to accomplish this for a while and it just struck me yesterday how to accomplish this task. I have done searches all over the internet looking for ways to email pages from my applications and finally I have done it!!! Every single s…
The viewer will learn the basics of jQuery, including how to invoke it on a web page. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery.: (CODE)
The viewer will learn the basics of jQuery including how to code hide show and toggles. Reference your jQuery libraries: (CODE) Include your new external js/jQuery file: (CODE) Write your first lines of code to setup your site for jQuery…

829 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question