Checking the referrer

Question

I'm using this to check if someone came from Reddit, however it doesn't work.

var ref = document.referrer; if(ref.match("/http://(www.)?reddit.com(/)?(.*)?/gi"){     alert('You came from Reddit'); } else {     alert('No you didn\'t'); } 

Suggestions on the regular expression are most welcome too.

Answer 1

Try this:

if (ref.match(/^https?:\/\/([^\/]+\.)?reddit\.com(\/|$)/i)) {   alert("Came from reddit"); } 

The regexp:

/^           # ensure start of string  http        # match 'http'  s?          # 's' if it exists is okay  :\/\/       # match '://'  ([^\/]+\.)? # match any non '/' chars followed by a '.' (if they exist)  reddit\.com # match 'reddit.com'  (\/|$)      # match '/' or the end of the string /i           # match case-insenitive