parse extra information in a link with javascript

Question

i have this link output from a facebook feed:

http://l.facebook.com/l.php?u=http%3A%2F%2Fwww.theguardian.com%2Ftravel%2F2014%2Fapr%2F25%2Fitaly-puglia-salento-region&h=2AQF4oNrg&s=1

and i need the final ouput like this:

http://www.theguardian.com/travel/2014/apr/25/italy-puglia-salento-region

so basically i have this bit to remove:

 http://l.facebook.com/l.php?u=

i was trying a regex in javascript but not very familiar with it:

Body = document.getElementsByTagName("body")[0].innerHTML;
regex = ???
Matches = regex.exec(Body);

any ideas on how to make it work?

score 1 · Answer 1 · answered Jul 05 '14 at 23:13

Use this :

function extractLinkFromFb(fbLink) {
    var encodedUri = fbLink.split('?u=');
    return decodeURIComponent(encodedUri[1]);
}

var link = 'http://l.facebook.com/l.php?u=http%3A%2F%2Fwww.theguardian.com%2Ftravel%2F2014%2Fapr%2F25%2Fitaly-puglia-salento-region&h=2AQF4oNrg&s=1';


var myExtractedLink = extractLinkFromFb(link);

The function extractLinkFromFb() will return your link.

score 0 · Answer 2 · answered Jul 05 '14 at 23:13

0

Before decoding the url, you can use this regex to grab the piece you want:

var myregex = /u=([^&#\s]+)/;
var matchArray = myregex.exec(yourString);
if (matchArray != null) {
    thematch = matchArray[1];
} else {
    thematch = "";
}

The parentheses in the regex captures the match to Group 1
u= serves as a delimiter, but is not captured in Group 1
[^&#\s] matches one character that is not a &, # or whitespace character. Tweak to suit.
the + quantifier matches one or more of these characters

answered Jul 05 '14 at 23:13

zx81

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how would you wrap that in a a whole script? – manny999 Jul 05 '14 at 23:20
@manny999 Sorry, I was just interested in answering a regex question, not in delivering a whole script. :) – zx81 Jul 05 '14 at 23:24

score 0 · Answer 3 · answered Jul 05 '14 at 23:30

var url = 'http://l.facebook.com/l.php?u=http%3A%2F%2Fwww.theguardian.com%2Ftravel%2F2014%2Fapr%2F25%2Fitaly-puglia-salento-region&h=2AQF4oNrg&s=1';
            var str1 = "http://l.facebook.com/l.php?u=";
            var str2 = "&h=2AQF4oNrg&s=1";


            var url = url.replace(str1, ""); 
            var url=url.split("&h=")
            var uri_dec = decodeURIComponent(url[0]); // =http://www.theguardian.com/travel/2014/apr/25/italy-puglia-salento-region
            //alert (uri_dec);
            //console.log (uri_dec);

parse extra information in a link with javascript

3 Answers3