It works for me: 
#!/usr/bin/perl
use warnings;
use strict;

my @arr2 = qw( mcs scr tsz unh );
my @arr1 = qw( spec.srn.1234 sepc.mcs.1234 );

for my $strfile (@arr1) {
    my @arr3 = split(/[.\n]/, $strfile);
    if (grep (/^$arr3[1]$/, @arr2)) {
        print "Entered in IF Loop\n";
    } else {
        print "Entered in ELSE Loop\n";
    }
}

__END__

Output:
Entered in ELSE Loop
Entered in IF Loop

[download]

Are you sure your input contains what you think? Try adding the information to the output: 

    if (grep (/^$arr3[1]$/, @arr2)) {
        print "Entered in IF Loop: /^$arr3[1]\$/ found in (@arr2)\n";
    } else {
        print "Entered in ELSE Loop: /^$arr3[1]\$/ not found in (@arr2
+)\n";
    }

[download]

Also note that I used $arr3[1] instead of @arr3[1]. warnings told me to do so.

لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: perl grep with regex by choroba
in thread perl grep with regex by swissknife

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