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Applying %s to %s will act on scalar(%s)

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Applying %s to %s will act on scalar(%s)
(W) The pattern match (//), substitution (s///), and translation (tr///) operators work on scalar values. If you apply one of them to an array or a hash, it will convert the array or hash to a scalar value -- the length of an array, or the population info of a hash -- and then work on that scalar value. This is probably not what you meant to do. See grep and map for alternatives.

Source: what's new for perl5.004
Copyright: Larry Wall, et al.
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