In line 19 you use the m// operator, since you used m!! you don't have to escape the: / it defeats the whole purpose. 
m!PATTERN/PATTERN!; # will work fine.

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also the same goes for line 22 
if m!PATTERN/PATTERN!;

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-tengo mas que aprender

In reply to Re: Help with a n Use of uninitialized value in join error message by s0ttle
in thread Help with a n Use of uninitialized value in join error message by dru145

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