See perlre.

/./ will match the character '.', but will also match many other characters. What you likely want is to quote the dot, so it loses its special meaning:

"." =~ m!\.!

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Update: GrandFather spotted a missing ! at the end of the regular expression

In reply to Re^3: Need RegExp help - doing an AND match by Corion
in thread Need RegExp help - doing an AND match by Anonymous Monk

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