I am trying to get the handle at learning (*SKIP)(*FAIL) to get the variable "look-behind" concept but I am missing something.

$RLine = "R.N. Raox, J. Pure and Appl. Phys.";
$Jrnl  = "Appl. Phys.";
if( $RLine =~ /^(.*?(?:(?: and| &)(*SKIP)(*FAIL))?) (\Q$Jrnl\E)$/ 
+){
    print "11: $1\n";
    print "22: $2\n";
    print "Matched\n";
}
else {
    print "Not Matched\n";
}

[download]

Basically when "and" or "&" comes just before the search pattern, it should not match. In this case if "and" comes anywhere in the line it matches.

$RLine = "R.N. Raox, J. Pure and Appl. Phys."; 
#Should not match -> Pattern OK

$RLine = "R.N. Raox, J. Pure text Appl. Phys."; 
#Should match -> Pattern OK

$RLine = "R.N. Raox, J. Pure and text Appl. Phys.";
#Should match but it is not -> Pattern NOT OK

$RLine = "R.N. and Raox, J. Pure text Appl. Phys.";
#Should match but it is not -> Pattern NOT OK

[download]

Could someone help me out please.

In reply to Another Look behind by dominic01

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