use strict;
my $str = 'movss xmm0,DWORD PTR [rip+0xd4],0x0000000000400978,eax,0x0,DWORD PTR [rbp-0x4] # 0x0000000000400c08
';
my $regex = qr/(?|^(\w+)|\w+\sPTR\s\[rip\+[^\],]+\](?=.*#\s0x0*([a-f0-9]+))|(\w+\sPTR\s\[[^\],]+\])|(?<!#\s)0x([a-f0-9]*)|(?<!#\s)(?|,(\w+)|(\w+),))/p;
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