Youtube I.D parsing for new URL formats

Question

This question has been asked before and I found this:

Reg exp for youtube link

but I'm looking for something slightly different.

I need to match the Youtube I.D itself compatible with all the possible youtube link formats. Not exclusively beginning with youtube.com.

For example:

http://www.youtube.com/watch?v=-wtIMTCHWuI

http://www.youtube.com/v/-wtIMTCHWuI?version=3&autohide=1

http://youtu.be/-wtIMTCHWuI

http://www.youtube.com/oembed?url=http%3A//www.youtube.com/watch?v%3D-wtIMTCHWuI&format=json

http://s.ytimg.com/yt/favicon-wtIMTCHWuI.ico

http://i2.ytimg.com/vi/-wtIMTCHWuI/hqdefault.jpg

is there a clever strategy I can use to match the video I.D -wtIMTCHWuI compatible with all these formats. I'm thinking character counting and matching = ? / . & characters.

Answer 1

I had to deal with this for a PHP class I wrote a few weeks ago and ended up with a regex that matches any kind of strings: With or without URL scheme, with or without subdomain, youtube.com URL strings, youtu.be URL strings and dealing with all kind of parameter sorting. You can check it out at GitHub or simply copy and paste the code block below:

/**  *  Check if input string is a valid YouTube URL  *  and try to extract the YouTube Video ID from it.  *  @author  Stephan Schmitz <[email protected]>  *  @param   $url   string   The string that shall be checked.  *  @return  mixed           Returns YouTube Video ID, or (boolean) false.  */ function parse_yturl($url) {     $pattern = '#^(?:https?://|//)?(?:www\.|m\.)?(?:youtu\.be/|youtube\.com/(?:embed/|v/|watch\?v=|watch\?.+&v=))([\w-]{11})(?![\w-])#';     preg_match($pattern, $url, $matches);     return (isset($matches[1])) ? $matches[1] : false; } 

Test cases: https://3v4l.org/GEDT0
JavaScript version: https://stackoverflow.com/a/10315969/624466

To explain the regex, here's a split up version:

/**  *  Check if input string is a valid YouTube URL  *  and try to extract the YouTube Video ID from it.  *  @author  Stephan Schmitz <[email protected]>  *  @param   $url   string   The string that shall be checked.  *  @return  mixed           Returns YouTube Video ID, or (boolean) false.  */ function parse_yturl($url) {     $pattern = '#^(?:https?://|//)?' # Optional URL scheme. Either http, or https, or protocol-relative.              . '(?:www\.|m\.)?'      #  Optional www or m subdomain.              . '(?:'                 #  Group host alternatives:              .   'youtu\.be/'        #    Either youtu.be,              .   '|youtube\.com/'    #    or youtube.com              .     '(?:'             #    Group path alternatives:              .       'embed/'        #      Either /embed/,              .       '|v/'           #      or /v/,              .       '|watch\?v='    #      or /watch?v=,              .       '|watch\?.+&v=' #      or /watch?other_param&v=              .     ')'               #    End path alternatives.              . ')'                   #  End host alternatives.              . '([\w-]{11})'         # 11 characters (Length of Youtube video ids).              . '(?![\w-])#';         # Rejects if overlong id.     preg_match($pattern, $url, $matches);     return (isset($matches[1])) ? $matches[1] : false; } 

Answer 2

I found this code this link:

<?php  /**   *  parse_youtube_url() PHP function   *  Author: takien   *  URL: http://takien.com   *    *  @param  string  $url    URL to be parsed, eg:    *                            http://youtu.be/zc0s358b3Ys,    *                            http://www.youtube.com/embed/zc0s358b3Ys  *                            http://www.youtube.com/watch?v=zc0s358b3Ys   *  @param  string  $return what to return   *                            - embed, return embed code   *                            - thumb, return URL to thumbnail image  *                            - hqthumb, return URL to high quality thumbnail image.  *  @param  string     $width  width of embeded video, default 560  *  @param  string  $height height of embeded video, default 349  *  @param  string  $rel    whether embeded video to show related video after play or not.   */     function parse_youtube_url($url,$return='embed',$width='',$height='',$rel=0){      $urls = parse_url($url);       //expect url is http://youtu.be/abcd, where abcd is video iD     if($urls['host'] == 'youtu.be'){           $id = ltrim($urls['path'],'/');      }      //expect  url is http://www.youtube.com/embed/abcd      else if(strpos($urls['path'],'embed') == 1){           $id = end(explode('/',$urls['path']));      }       //expect url is abcd only      else if(strpos($url,'/')===false){          $id = $url;      }      //expect url is http://www.youtube.com/watch?v=abcd      else{          parse_str($urls['query']);          $id = $v;      }      //return embed iframe      if($return == 'embed'){          return '<iframe width="'.($width?$width:560).'" height="'.($height?$height:349).'" src="http://www.youtube.com/embed/'.$id.'?rel='.$rel.'" frameborder="0" allowfullscreen>';      }      //return normal thumb      else if($return == 'thumb'){          return 'http://i1.ytimg.com/vi/'.$id.'/default.jpg';      }      //return hqthumb      else if($return == 'hqthumb'){          return 'http://i1.ytimg.com/vi/'.$id.'/hqdefault.jpg';      }      // else return id      else{          return $id;      }  }  ?> 

I'm dealing with this too so if you find a better solution please let me know. It doesn't quite do what you need for images out of the box but it could be easily adapted.