Regex to get string with complex structure in Javascript

Question

I have a link look like:

var str = "http://example.com/ep-1-29838.html";

I want to get only 29838

I tried with:

str = str.replace(^([-])\/([.html])$\w+, "");

I don't have many experiences with Regex. Thanks.

Answer 1

Match the last digits followed by a dot and file extension:

 var str = "http://example.com/ep-1-29838.html"; console.log( str.match(/\\d+(?=\\.\\w+$)/) ); 

Answer 2

This could be an approach:

"http://example.com/ep-1-29838.html".match(/(\d+)\.html$/)

It basically means "match and store in a group one or more digit (0-9) that are followed by .html at the end of the string".

The value returned is an array of two element, you're interested in the second one.

Answer 3

You don't have to use regex if it's this rigid - more readable to me like this:

 var str = "http://example.com/ep-1-29838.html"; str = str.split('-') /* split the string on hyphen */ .pop() /* get last of generated array */ .replace('.html', ''); /* now remove the file extension */ console.log(str);