Question

163

Checking the referrer

rated 0 times [ 165] [ 2] / answers: 1 / hits: 55274 / 15 Years ago, fri, january 8, 2010, 12:00:00

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.

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karleel

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2 Years ago

answered 15 Years ago sashacitlallik · Accepted Answer

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