如何使用JavaScript正则表达式进行匹配？

Question

This is my code:

var name = 'somename';
var pass = '123somen456';
var regex = new RegExp('.*' + pass + '.*', 'i');

alert(name.match(regex));

The regex just wont match, what I dont understand. Whats wrong here? I want to have a match as soon as any part of name is contained in pass, as long as that match is at least 4 chars long. Example:

som --> no match
some --> match

Thanks!

Answer 1

This regex requires that there are any amount of any character, then 123somen456 , and then any amount of any character. name.match(regex) will not return anything because name does not contain the string 123somen456 .

To test regular expressions, I recommend using http://regexpal.com/ .

Answer 2

It sounds, you may need to apply some algorithms like this or this .

If it is possible using regex in javascript, I'm interested to know.

sorry buddy, I have no option to comment.