use strict;
my $str = '<iframe src="https://www.youtube.com/embed/lfLRV19y6hg?disablekb=1&rel=0&showinfo=0" width="780" height="439" frameborder="0" allowfullscreen="allowfullscreen"></iframe>
<iframe src="https://www.youtube.com/embed/3xzCyOdf4Qc?disablekb=1&rel=0&showinfo=0" width="780" height="439" frameborder="0" allowfullscreen="allowfullscreen"></iframe>
<iframe src="https://www.youtube.com/embed/JtpT4LLxFv4?disablekb=1&rel=0&showinfo=0" width="780" height="440" frameborder="0" allowfullscreen="allowfullscreen"></iframe>
<iframe src="https://www.youtube.com/embed/R6UAHzmxJ_g?disablekb=1&rel=0&showinfo=0" width="780" height="439" frameborder="0" allowfullscreen="allowfullscreen"></iframe>
<iframe src="https://www.youtube.com/embed/DIFGObcX9A4?disablekb=1&rel=0&showinfo=0" width="780" height="439" frameborder="0" allowfullscreen="allowfullscreen"></iframe>
<iframe src="https://www.youtube.com/embed/HtDEqzAk_48?disablekb=1&rel=0&showinfo=0" width="780" height="439" frameborder="0" allowfullscreen="allowfullscreen"></iframe>
<iframe src="https://www.youtube.com/embed/n5GpN1Xa4q0?disablekb=1&rel=0&showinfo=0" width="780" height="439" frameborder="0" allowfullscreen="allowfullscreen"></iframe>
<iframe id="ytplayer" type="text/html" width="720" height="405" src="https://www.youtube.com/embed/M7lc1UVf-VE?autoplay=1&cc_load_policy=1&disablekb=1&enablejsapi=1&modestbranding=1&playsinline=1&rel=0&showinfo=0&color=white"
frameborder="0" allowfullscreen>
<iframe width="560" height="315" src="https://www.youtube.com/embed/Hb9-Bvne_gQ" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
<iframe width="560" height="315" src="https://www.youtube-nocookie.com/embed/Hb9-Bvne_gQ?rel=0" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>';
my $regex = qr/<iframe[\s\w="\/]*src="(?<src>(?:https*:\/\/)?www\.youtube(?:-nocookie)?\.com\/embed\/(?<vid>[-a-zA-Z0-9@:;%_+.~#&=]+)\??(?<params>[-a-zA-Z0-9@:;%_+.~#?&\/=]*))"[^>]*>(?:<\/iframe>)?$/mp;
if ( $str =~ /$regex/g ) {
print "Whole match is ${^MATCH} and its start/end positions can be obtained via \$-[0] and \$+[0]\n";
# print "Capture Group 1 is $1 and its start/end positions can be obtained via \$-[1] and \$+[1]\n";
# print "Capture Group 2 is $2 ... and so on\n";
}
# ${^POSTMATCH} and ${^PREMATCH} are also available with the use of '/p'
# Named capture groups can be called via $+{name}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Perl, please visit: http://perldoc.perl.org/perlre.html