You've heard of grep, right? 
print grep { $_ eq $var } qw( 1 2 3 4 5 ) ? "Found.\n" : "Not found.\n
+";

[download]
Note though that grep loops over the entire array everytime, so for large arrays, simon.proctor's function would be better.

[ ar0n ]

In reply to (ar0n) Re (2): Is there an InString-like function? by ar0n
in thread Is there an InString-like function? by Anonymous Monk

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