callback function in javascript replace() is not called

Question

I would like to replace the domain of a cookie string:

var cookieText = 'test=value; path=/; domain=.mydomain.com';

cookieText.replace(/[Dd]omain=(\.?)([a-zA-Z0-9\.]*);/, function(match, dot, domain){
    return dot + myfunction(domain)
});

But it seems mycallback function is never called. What is wrong with the code?

Answer 1

That's because you regex doesn't match any substring in your cookieText string. This happens because you pattern expects a ; at the end of each substring, but that doesn't happen to domain=.mydomain.com . Try this regex instead:

/[Dd]omain=(\.?)([a-zA-Z0-9\.]*);?/

Then it will work:

var cookieText = 'test=value; path=/; domain=.mydomain.com';

cookieText.replace(/[Dd]omain=(\.?)([a-zA-Z0-9\.]*);/, function(match, dot, domain){
    console.log(match);
    return dot + myfunction(domain);
});