grep is one way: 
use warnings;
use strict;

my $input_val = 'abc';
my @names = ("abc", "def", "ijk");

if (grep { $input_val eq $_ } @names)
{print "Match Found";}
else
{ print "Match Failed";}

print "\n";

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See also (for potentially faster look-ups):

In reply to Re: if Loop with array by toolic
in thread if Loop with array by mayank2211

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