How to Find All Youtube Video Ids in a String Using a Regex

urls = ['http://www.youtube.com/watch?v=cKZDdG9FTKY&feature=channel','http://www.youtube.com/watch?v=yZ-K7nCVnBI&playnext_from=TL&videos=osPknwzXEas&feature=sub','http://youtu.be/6dwqZw0j_jY','http://www.youtube.com/watch?v=6dwqZw0j_jY&feature=youtu.be','http://www.youtube.com/watch?v=yZ-K7nCVnBI&playnext_from=TL&videos=osPknwzXEas&feature=sub','http://www.youtube.com/embed/nas1rJpm7wY?rel=0','http://www.youtube.com/watch?v=peFZbP64dsU','http://youtube.com/v/dQw4w9WgXcQ?feature=youtube_gdata_player','http://youtube.com/watch?v=dQw4w9WgXcQ&feature=youtube_gdata_player','http://www.youtube.com/watch?v=dQw4w9WgXcQ&feature=youtube_gdata_player','http://youtu.be/afa-5HQHiAs','http://youtu.be/dQw4w9WgXcQ?feature=youtube_gdata_player','//www.youtube-nocookie.com/embed/up_lNV-yoK4?rel=0','http://www.youtube.com/user/Scobleizer#p/u/1/1p3vcRhsYGo','http://www.youtube.com/ytscreeningroom?v=NRHVzbJVx8I','http://www.youtube.com/user/SilkRoadTheatre#p/a/u/2/6dwqZw0j_jY','http://www.youtube.com/user/Scobleizer#p/u/1/1p3vcRhsYGo?rel=0','http://www.youtube.com/watch?v=cKZDdG9FTKY&feature=channel','http://www.youtube.com/ytscreeningroom?v=NRHVzbJVx8I','http://youtube.com/vi/dQw4w9WgXcQ?feature=youtube_gdata_player','http://youtube.com/?v=dQw4w9WgXcQ&feature=youtube_gdata_player','http://youtube.com/?vi=dQw4w9WgXcQ&feature=youtube_gdata_player','http://youtube.com/watch?vi=dQw4w9WgXcQ&feature=youtube_gdata_player']
_getVideoIdFromUrl = function (value) {  var regEx = "^(?:https?:)?//[^/]*(?:youtube(?:-nocookie)?\.com|youtu\.be).*[=/]([-\\w]{11})(?:\\?|=|&|$)";  var matches = value.match(regEx);  if (matches) {      console.log(value + "\n" + matches[1] + "\n");  }  return false;}
urls.forEach(function(url) {  _getVideoIdFromUrl(url)});

PHP: preg_match_all Youtube video IDs from text

To expand on my comment, you're replacing the result text each time with the original string, $sample_text. This is a simple fix, just initialise $processed_text at the start, and work on that.

function regex($sample_text) {
    $processed_text = $sample_text;
    if (preg_match_all('#(?:https?:\/\/)?(?:m\.|www\.)?(?:youtu\.be\/|youtube\-nocookie\.com\/embed\/|youtube\.com\/(?:embed\/|v\/|e\/|\?v=|shared\?ci=|watch\?v=|watch\?.+&v=))([-_A-Za-z0-9]{10}[AEIMQUYcgkosw048])(.*?)\b#s', $sample_text, $matches, PREG_SET_ORDER)) {
        print_r($matches);
        foreach ($matches as $match) {
            $add = ' (here)';
            $processed_text = str_replace($match[0], $match[0] . $add, $processed_text);
        }
    }
    return $processed_text;
}
echo regex($sample_test);

Your regex is also not matching to the end of the URL. For the purposes of the sample text you provided, you could match up to anything that isn't whitespace:

'#(?:https?:\/\/)?(?:m\.|www\.)?(?:youtu\.be\/|youtube\-nocookie\.com\/embed\/|youtube\.com\/(?:embed\/|v\/|e\/|\?v=|shared\?ci=|watch\?v=|watch\?.+&v=))([-_A-Za-z0-9]{10}[AEIMQUYcgkosw048])\S*#s'

However this won't match characters like " or ., but you could add those in as an | in a group. You seem to have a pretty good grasp of regex, so I'll assume you can work this out - if not, comment and I'll update my answer.

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For completeness sake, I've included the completed code with my regex:

function regex($sample_text) {
    $processed_text = $sample_text;
    if (preg_match_all('#(?:https?:\/\/)?(?:m\.|www\.)?(?:youtu\.be\/|youtube\-nocookie\.com\/embed\/|youtube\.com\/(?:embed\/|v\/|e\/|\?v=|shared\?ci=|watch\?v=|watch\?.+&v=))([-_A-Za-z0-9]{10}[AEIMQUYcgkosw048])\S*#s', $sample_text, $matches, PREG_SET_ORDER)) {
        print_r($matches);
        foreach ($matches as $match) {
            $add = ' (here)';
            $processed_text = str_replace($match[0], $match[0] . $add, $processed_text);
        }
    }
    return $processed_text;
}
echo regex($sample_test);

Extract youtube video ID from url with R stringr regex

You could use something like the following, but note that it's pretty heavily hard-coded to the examples you provided.

links = c("youtube.com/v/kFF0v0FQzEI", 
          "youtube.com/vi/kFF0v0FQzEI", 
          "youtu.be/kFF0v0FQzEI", 
          "www.youtube.com/v/kFF0v0FQzEI?feature=autoshare&version=3&autohide=1&autoplay=1", 
          "www.youtube.com/watch?v=kFF0v0FQzEI&list=PLuV2ACKGzAMsG-pem75yNYhBvXZcl-mj_&index=1", 
          "youtube.com/watch?v=kFF0v0FQzEI", 
          "http://www.youtube.com/watch?argv=xyz&v=kFF0v0FQzEI")

get_id = function(link) {
  if (stringr::str_detect(link, '/watch\\?')) {
    rgx = '(?<=\\?v=|&v=)[\\w]+'
  } else {
    rgx = '(?<=/)[\\w]+/?(?:$|\\?)'
  }
  stringr::str_extract(link, rgx)
}

ids = unname(sapply(links, get_id))
# [1] "kFF0v0FQzEI"  "kFF0v0FQzEI"  "kFF0v0FQzEI"  "kFF0v0FQzEI?" 
#     "kFF0v0FQzEI"  "kFF0v0FQzEI"  "kFF0v0FQzEI"

Regex to find Youtube Link in string

This would work for you,

\S*\bwww\.youtube\.com\S*

\S* matches zero or more non-space characters.

Code would be,

preg_match('~\S*\bwww\.youtube\.com\S*~', $str, $matches);

DEMO

And i made Some corrections to your original regex.

(?:https?://)?(?:www.)?(?:youtube.com|youtu.be)/(?:watch\?v=)?([^\s]+)

DEMO

$str = "Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard  dummy text ever since the 1500s, https://www.youtube.com/watch?v=7TL02DA5MZM when an unknown printer took a galley of type and scrambled it to make a type";
preg_match('~(?:https?://)?(?:www.)?(?:youtube.com|youtu.be)/(?:watch\?v=)?([^\s]+)~', $str, $match);
print_r($match);

Output:

Array
(
    [0] => https://www.youtube.com/watch?v=7TL02DA5MZM
    [1] => 7TL02DA5MZM
)

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