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however the quality=large at the end could be quality=small quality=medium etc so I can't use that in the regex

Use this then, it works I believe:
... if ( my @arr = ($line) =~ m/itag=(.+?)&url=(.+?=.+?)(?=,itag.+?)/ig ) +{ print join "\n" => @arr; } ...
OR
use warnings; use strict; while (<DATA>) { chomp; if ( my @arr = /itag=(.+?)&url=(.+?=.+?)(?=,itag.+?)/ig ) { print join "\n" => @arr; } } __DATA__ itag=44&url=http://o-o---preferred---sn-u5a3u5a3-h5oe---v13---lscache3 +.c.youtube.com/videoplayback?upn=8kbZJLkF5PA&sparams=cp%2Cid%2Cip%2Ci +pbits%2Citag%2Cratebypass%2Csource%2Cupn%2Cexpire&fexp=927101%2C92300 +6%2C922401%2C920704%2C912806%2C913419%2C913546%2C913556%2C919349%2C91 +9351%2C925109%2C919003%2C920201%2C912706&key=yt1&expire=1348823962&it +ag=44&ipbits=8&sver=3&ratebypass=yes&mt=1348800611&ip=92.22.37.231&mv +=m&source=youtube&ms=au&cp=U0hTTVhNUV9LTENOM19QR1VKOkFyQWNVSVFNbmNL&i +d=1100a4b92b939cd6&type=video/webm;+codecs="vp8.0,+vorbis"&fallback_h +ost=tc.v13.cache3.c.youtube.com&sig=8353F6329CDA8168C4F7F29E20F2AE3F6 +509D85F.C582D63C02534232CE8E28D5ADC5B119AAEF2963&quality=large,itag=3 +5&url=http://o-o---preferred---sn-u5a3u5a3-h5oe---v11---lscache4.c.yo +utube.com/videoplayback?upn=8kbZJLkF5PA&sparams=algorithm%2Cburst%2Cc +p%2Cfactor%2Cid%2Cip%2Cipbits%2Citag%2Csource%2Cupn%2Cexpire&fexp=927 +101%2C923006%2C922401%2C920704%2C912806%2C913419%2C913546%2C913556%2C +919349%2C919351%2C925109%2C919003%2C920201%2C912706&expire=1348823962 +&algorithm=throttle-factor&burst=40&ip=92.22.37.231&itag=35&sver=3&ke +y=yt1&mt=1348800611&mv=m&source=youtube&ms=au&ipbits=8&factor=1.25&cp +=U0hTTVhNUV9LTENOM19QR1VKOkFyQWNVSVFNbmNL&id=1100a4b92b939cd6&type=vi +deo/x-flv&fallback_host=tc.v11.cache4.c.youtube.com&sig=885C9C098DF9D +80E780177E01CF944BC4F9564FE.9A374618A2BE8C2E562C8622DCB449A7071E37BD& +quality=large,itag=104&url=http://o-o---preferred---sn-u5a3u5a3-h5oe- +--v13---lscache3.c.youtube.com/videoplayback?upn=8kbZJLkF5PA&sparams= +cp%2Cid%2Cip%2Cipbits%2Citag%2Cratebypass%2Csource%2Cupn%2Cexpire&fex +p=927101%2C923006%2C922401%2C920704%2C912806%2C913419%2C913546%2C9135 +56%2C919349%2C919351%2C925109%2C919003%2C920201%2C912706&key=yt1&expi +re=1348823962&itag=44&ipbits=8&sver=3&ratebypass=yes&mt=1348800611&ip +=92.22.37.231&mv=m&source=youtube&ms=au&cp=U0hTTVhNUV9LTENOM19QR1VKOk +FyQWNVSVFNbmNL&id=1100a4b92b939cd6&type=video/webm;+codecs="vp8.0,+vo +rbis"&fallback_host=tc.v13.cache3.c.youtube.com&sig=8353F6329CDA8168C +4F7F29E20F2AE3F6509D85F.C582D63C02534232CE8E28D5ADC5B119AAEF2963&qual +ity=small,itag=15&url=http://o-o---preferred---sn-u5a3u5a3-h5oe---v11 +---lscache4.c.youtube.com/videoplayback?upn=8kbZJLkF5PA&sparams=algor +ithm%2Cburst%2Ccp%2Cfactor%2Cid%2Cip%2Cipbits%2Citag%2Csource%2Cupn%2 +Cexpire&fexp=927101%2C923006%2C922401%2C920704%2C912806%2C913419%2C91 +3546%2C913556%2C919349%2C919351%2C925109%2C919003%2C920201%2C912706&e +xpire=1348823962&algorithm=throttle-factor&burst=40&ip=92.22.37.231&i +tag=35&sver=3&key=yt1&mt=1348800611&mv=m&source=youtube&ms=au&ipbits= +8&factor=1.25&cp=U0hTTVhNUV9LTENOM19QR1VKOkFyQWNVSVFNbmNL&id=1100a4b9 +2b939cd6&type=video/x-flv&fallback_host=tc.v11.cache4.c.youtube.com&s +ig=885C9C098DF9D80E780177E01CF944BC4F9564FE.9A374618A2BE8C2E562C8622D +CB449A7071E37BD&quality=quality=small quality=medium,itag=55&url=http +://o-o---preferred---sn-u5a3u5a3-h5oe---v11---lscache4.c.youtube.com/ +videoplayback?upn=8kbZJLkF5PA&sparams=algorithm%2Cburst%2Ccp%2Cfactor +%2Cid%2Cip%2Cipbits%2Citag%2Csource%2Cupn%2Cexpire&fexp=927101%2C9230 +06%2C922401%2C920704%2C912806%2C913419%2C913546%2C913556%2C919349%2C9 +19351%2C925109%2C919003%2C920201%2C912706&expire=1348823962&algorithm +=throttle-factor&burst=40&ip=92.22.37.231&itag=35&sver=3&key=yt1&mt=1 +348800611&mv=m&source=youtube&ms=au&ipbits=8&factor=1.25&cp=U0hTTVhNU +V9LTENOM19QR1VKOkFyQWNVSVFNbmNL&id=1100a4b92b939cd6&type=video/x-flv& +fallback_host=tc.v11.cache4.c.youtube.com&sig=885C9C098DF9D80E780177E +01CF944BC4F9564FE.9A374618A2BE8C2E562C8622DCB449A7071E37BD&quality=qu +ality=small quality=medium,itag= ...AND SO ON
Output
44 http://o-o---preferred---sn-u5a3u5a3-h5oe---v13---lscache3.c.youtube.c +om/videoplayback?upn=8kbZJLkF5PA&sparams=cp%2Cid%2Cip%2Cipbits%2Citag +%2Cratebypass%2Csource%2Cupn%2Cexpire&fexp=927101%2C923006%2C922401%2 +C920704%2C912806%2C913419%2C913546%2C913556%2C919349%2C919351%2C92510 +9%2C919003%2C920201%2C912706&key=yt1&expire=1348823962&itag=44&ipbits +=8&sver=3&ratebypass=yes&mt=1348800611&ip=92.22.37.231&mv=m&source=yo +utube&ms=au&cp=U0hTTVhNUV9LTENOM19QR1VKOkFyQWNVSVFNbmNL&id=1100a4b92b +939cd6&type=video/webm;+codecs="vp8.0,+vorbis"&fallback_host=tc.v13.c +ache3.c.youtube.com&sig=8353F6329CDA8168C4F7F29E20F2AE3F6509D85F.C582 +D63C02534232CE8E28D5ADC5B119AAEF2963&quality=large 35 http://o-o---preferred---sn-u5a3u5a3-h5oe---v11---lscache4.c.youtube.c +om/videoplayback?upn=8kbZJLkF5PA&sparams=algorithm%2Cburst%2Ccp%2Cfac +tor%2Cid%2Cip%2Cipbits%2Citag%2Csource%2Cupn%2Cexpire&fexp=927101%2C9 +23006%2C922401%2C920704%2C912806%2C913419%2C913546%2C913556%2C919349% +2C919351%2C925109%2C919003%2C920201%2C912706&expire=1348823962&algori +thm=throttle-factor&burst=40&ip=92.22.37.231&itag=35&sver=3&key=yt1&m +t=1348800611&mv=m&source=youtube&ms=au&ipbits=8&factor=1.25&cp=U0hTTV +hNUV9LTENOM19QR1VKOkFyQWNVSVFNbmNL&id=1100a4b92b939cd6&type=video/x-f +lv&fallback_host=tc.v11.cache4.c.youtube.com&sig=885C9C098DF9D80E7801 +77E01CF944BC4F9564FE.9A374618A2BE8C2E562C8622DCB449A7071E37BD&quality +=large 104 http://o-o---preferred---sn-u5a3u5a3-h5oe---v13---lscache3.c.youtube.c +om/videoplayback?upn=8kbZJLkF5PA&sparams=cp%2Cid%2Cip%2Cipbits%2Citag +%2Cratebypass%2Csource%2Cupn%2Cexpire&fexp=927101%2C923006%2C922401%2 +C920704%2C912806%2C913419%2C913546%2C913556%2C919349%2C919351%2C92510 +9%2C919003%2C920201%2C912706&key=yt1&expire=1348823962&itag=44&ipbits +=8&sver=3&ratebypass=yes&mt=1348800611&ip=92.22.37.231&mv=m&source=yo +utube&ms=au&cp=U0hTTVhNUV9LTENOM19QR1VKOkFyQWNVSVFNbmNL&id=1100a4b92b +939cd6&type=video/webm;+codecs="vp8.0,+vorbis"&fallback_host=tc.v13.c +ache3.c.youtube.com&sig=8353F6329CDA8168C4F7F29E20F2AE3F6509D85F.C582 +D63C02534232CE8E28D5ADC5B119AAEF2963&quality=small 15 http://o-o---preferred---sn-u5a3u5a3-h5oe---v11---lscache4.c.youtube.c +om/videoplayback?upn=8kbZJLkF5PA&sparams=algorithm%2Cburst%2Ccp%2Cfac +tor%2Cid%2Cip%2Cipbits%2Citag%2Csource%2Cupn%2Cexpire&fexp=927101%2C9 +23006%2C922401%2C920704%2C912806%2C913419%2C913546%2C913556%2C919349% +2C919351%2C925109%2C919003%2C920201%2C912706&expire=1348823962&algori +thm=throttle-factor&burst=40&ip=92.22.37.231&itag=35&sver=3&key=yt1&m +t=1348800611&mv=m&source=youtube&ms=au&ipbits=8&factor=1.25&cp=U0hTTV +hNUV9LTENOM19QR1VKOkFyQWNVSVFNbmNL&id=1100a4b92b939cd6&type=video/x-f +lv&fallback_host=tc.v11.cache4.c.youtube.com&sig=885C9C098DF9D80E7801 +77E01CF944BC4F9564FE.9A374618A2BE8C2E562C8622DCB449A7071E37BD&quality +=quality=small quality=medium 55 http://o-o---preferred---sn-u5a3u5a3-h5oe---v11---lscache4.c.youtube.c +om/videoplayback?upn=8kbZJLkF5PA&sparams=algorithm%2Cburst%2Ccp%2Cfac +tor%2Cid%2Cip%2Cipbits%2Citag%2Csource%2Cupn%2Cexpire&fexp=927101%2C9 +23006%2C922401%2C920704%2C912806%2C913419%2C913546%2C913556%2C919349% +2C919351%2C925109%2C919003%2C920201%2C912706&expire=1348823962&algori +thm=throttle-factor&burst=40&ip=92.22.37.231&itag=35&sver=3&key=yt1&m +t=1348800611&mv=m&source=youtube&ms=au&ipbits=8&factor=1.25&cp=U0hTTV +hNUV9LTENOM19QR1VKOkFyQWNVSVFNbmNL&id=1100a4b92b939cd6&type=video/x-f +lv&fallback_host=tc.v11.cache4.c.youtube.com&sig=885C9C098DF9D80E7801 +77E01CF944BC4F9564FE.9A374618A2BE8C2E562C8622DCB449A7071E37BD&quality +=quality=small quality=medium
If you tell me, I'll forget.
If you show me, I'll remember.
if you involve me, I'll understand.
--- Author unknown to me

In reply to Re^3: Split on regex, don't match partial regex by 2teez
in thread Split on regex, don't match partial regex by aldo

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