javascript regular expression replacement doesnt work?

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 m开发者_运维知识库ust become http://myweb.com/page/2/id/2

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/

Use url rather than str, if you want to replace something in the String stored in the url variable.

You have a naming misspell. Rename your url var to str or change the str.replace to url.replace:

newUrl = url.replace('/page\/[0-9]+/', 'page/2');