How to extract the number using regular expressions in JS?

Posted on 2011-02-22
Last Modified: 2012-05-11
Can you please let me know how I can extract the "anynumber" from the following string?

<TD ALIGN=RIGHT NOWRAP><anystring HREF='/atv-bin/mytree.cgi?line=anystring&job=anynumber' TARGET=middle_frame

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An example case:
The number that I want to assign to a variable using regular expressions is 515595:
<TD ALIGN=RIGHT NOWRAP><C HREF='/atv-bin/mytree.cgi?line=C&job=51595' TARGET=middle_frame

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How can I do that?


Question by:Tolgar
  • 2
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LVL 20

Expert Comment

ID: 34952209

//try this:

var sample = "<TD ALIGN=RIGHT NOWRAP><C HREF='/atv-bin/mytree.cgi?line=C&job=51595' TARGET=middle_frame ";

alert( sample.replace( /^.*job=(\d+).*$/, "$1" ) );

Author Comment

ID: 34952314
Why did you use replace?

Can we use match as well? Because I don't want to replace it with something else.

LVL 20

Accepted Solution

Proculopsis earned 250 total points
ID: 34952581


var sample = "<TD ALIGN=RIGHT NOWRAP><C HREF='/atv-bin/mytree.cgi?line=C&job=51595' TARGET=middle_frame ";
var digits = sample.replace( /^.*job=(\d+).*$/, "$1" );
alert( digits );

digits = sample.match( /(?:job=)(\d+)/ );
alert( (digits)? digits[1] : 0 );
LVL 74

Expert Comment

by:käµfm³d 👽
ID: 34953040
>>  Because I don't want to replace it with something else.

Well it wouldn't actually replace the string unless you assigned the result back to the source string. String replacment in JS is not in-place. This means when you call the replacement function, the resulting, replaced string is returned from the function and the original string is untouched. Many languages perform this kind of string handling.
LVL 74

Expert Comment

by:käµfm³d 👽
ID: 34953060
As an example:
var source = "Hello World!"

alert(source);                   // displays: Hello World!
alert(source.replace(/l/, ''));  // displays: Heo Word!
alert(source);                   // displays: Hello World!
source = source.replace(/l/, ''));
alert(source);                   // displays: Heo Word!

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