use strict;
my $str = '[gaiarch=slider]
[img url="http://i1251.photobucket.com/albums/hh543/Knight-Yoshi/trade_c.png" text="Trading Image" goto="http://www.gaiaonline.com/gaia/bank.php?mode=trade&uid=15388423"],[img url="http://i1251.photobucket.com/albums/hh543/Knight-Yoshi/friend_c.png" text="Friends Image" goto="http://www.gaiaonline.com/friends/add/15388423"][/gaiarch]
[gaiarch=slider][img url="http://i1251.photobucket.com/albums/hh543/Knight-Yoshi/gaiaonline/thread/post/dark-center_bottom_zps419960f4.gif" text="bottom bar"]
[img url="http://i1251.photobucket.com/albums/hh543/Knight-Yoshi/gaiaonline/thread/post/star-say_right_zpsdc3769f3.png" goto="http://www.gaiaonline.com/"][/gaiarch] ';
my $regex = qr/^([ ])?\[(\/?)gaiarch(=[^"]*)?]([ ])?|([ ])?\[(\/?)gaiarch(=[^"]*)?]([ ])?$/ip;
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