parse text with multiple links using regex in javascript

Question

Hi i m having a text having multiple links wrapped inside text...

i want a regex(i m using javascript) which can parse the text and return a array of the links...

for example for the text...

http://www.youtube.com/watch?v=-LiPMxFBLZY
testing
http://www.youtube.com/watch?v=Q3-l22b_Qg8&feature=related

the regex would parse the text and return a array of the links

arr[0] = "http://www.youtube.com/watch?v=-LiPMxFBLZY"
arr[1] = "http://www.youtube.com/watch?v=Q3-l22b_Qg8&feature=related"

i m trying to do so with the code...

var ytre =/(\b(https?|ftp|file):\/\/[-A-Z0-9+&@#\/%?=~_|!:,.;]*[-A-Z0-9+&@#\/%=~_|])/ig ;
var matches = new Array();

                    matches = ytre.exec(text);
                    var jm;
                    if (matches !=null )
                    {
                        for (jm=0; jm<matches.length; jm++)
                        {
                            console.log(matches[jm]);
                        }
                    }

but its not returning the appropriate results...

please help

thanks

library which does this: medialize.github.com/URI.js (see medialize.github.com/URI.js/docs.html#static-withinString) — chrisv
– chrisv, Commented Jan 13, 2013 at 11:11

codaddict · Accepted Answer · 2010-12-30 07:44:33Z

8

How about:

var text = 'http://www.youtube.com/watch?v=-LiPMxFBLZY testing http://www.youtube.com/watch?v=Q3-l22b_Qg8&feature=related http://yahoo.com';

var ytre = /(\b(https?|ftp|file):\/\/[\-A-Z0-9+&@#\/%?=~_|!:,.;]*[\-A-Z0-9+&@#\/%=~_|])/ig;

var resultArray = text.match(ytre);

See it

answered Dec 30, 2010 at 7:44

codaddict

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3 Comments

Pradyut Bhattacharya Over a year ago

:O thanks.. really new to regex... now if i have to check it only for youtube links...jsfiddle.net/WWmvT/2

codaddict Over a year ago

You can do:jsfiddle.net/WWmvT/4 you can also make the http:// and the www. part optional.

Pradyut Bhattacharya Over a year ago

anything which checks watch?v=-LiPMxFBLZY in the link like in this regex... /http:\/\/(?:www\.)?youtube.*watch\?v=([a-zA-Z0-9\-_]+)/

Mike Samuel · Accepted Answer · 2010-12-30 09:06:20Z

To parse URLs, using regexs, look at the RFC that defines URLs.

So to find regular expressions, use a variant that makes the protocol and authority non-optional, like /\b(([^:\/?#]+):)(\/\/([^\/?#]*))([^?#]*)(\?([^#]*))?(#(.*))?/gi.

http://www.ietf.org/rfc/rfc3986.txt says

Appendix B. Parsing a URI Reference with a Regular Expression

As the "first-match-wins" algorithm is identical to the "greedy"
disambiguation method used by POSIX regular expressions, it is natural and commonplace to use a regular expression for parsing the
potential five components of a URI reference.

The following line is the regular expression for breaking-down a
well-formed URI reference into its components.
  ^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?
   12            3  4          5       6  7        8 9
The numbers in the second line above are only to assist readability; they indicate the reference points for each subexpression (i.e., each
paired parenthesis). We refer to the value matched for subexpression as $. For example, matching the above expression to
  http://www.ics.uci.edu/pub/ietf/uri/#Related
results in the following subexpression matches:
  $1 = http:
  $2 = http
  $3 = //www.ics.uci.edu
  $4 = www.ics.uci.edu
  $5 = /pub/ietf/uri/
  $6 = <undefined>
  $7 = <undefined>
  $8 = #Related
  $9 = Related
where indicates that the component is not present, as is
the case for the query component in the above example. Therefore, we
can determine the value of the five components as
  scheme    = $2
  authority = $4
  path      = $5
  query     = $7
  fragment  = $9

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