CODEWITHSUNDEEP
javascriptregex
Yalda Samanak
Yalda Samanak

Reputation: 19

Regular expressions help in javascript?

i am not sure as to why this code is not working, on the website where i found the code it say it should print any letter between capital a to z. i tried the same thing with a number, to print numbers between 0-9 but it does not work.

<!DOCTYPE html>
<html>
  <body>
    <script>
      var string = "THIS IS AN EXAMPLE";
      var str = /[A-Z]/;

      document.write(string.match(str));
    </script>
  </body>
</html>

Upvotes: 0

Views: 85

Answers (1)

Joe
Joe

Reputation: 2105

EDIT:

updated after clarified question

 <script>

 var string = "1 2 3 4 8 9 11 15 18 293";
 var str = /[0-9]*/g;

 var arr = string.match(str);

 var length = arr.length;

 for (var i = 0; i < length; i++) {
     if ( parseInt(arr[i]) <= 9 && parseInt(arr[i]) >= 1){
         document.write(arr[i] + " ");
     }
 }

 </script>

new fiddle here

what you are telling javascript to do is only print the first character in the array of results matching your regex. you also have not accounted for the "space" character in your regular expression

to the best of my understanding this is what you are trying to accomplish - but if this is incorrect please clarify what results you are trying to achieve.

take a look at this fiddle

 <script>

 var string = "THIS IS AN EXAMPLE";
 var str = /[A-Z ]*/;

 document.write(string.match(str));

 </script>

note how ive used /[A-Z ]*/

including the space character in the matching set as well as an asterisk to denote matching any number of these characters. if you are attempting to only match the first word and stop at a space simply remove it.

in either case

here is a great article from the mozilla developer network explaining regex in all of its glory - pertaining specifically to its use with javascript

in case you decide you would like to take a gander at the 'manual'

Upvotes: 3

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