Question

why this regular expression replacement doesnt work?

var url = 'http://myweb.com/page/1/id/2'; 

newUrl = url.replace('/page\/[0-9]+/', 'page/2'); //it must become http://myweb.com/page/2/id/2

Answer 1

You need to do two things:

1. change str.replace to url.replace

2. remove the ' around the regex

   var url = 'http://myweb.com/page/1/id/2'; 
   
   newUrl = url.replace(/page\/[0-9]+/, 'page/2'); 
   

Example: http://jsfiddle.net/fhqXn/