Just a perl 5 physicist here. I had to run to the Camel book to find out that 
grep existed in the world of perl. But I have done this (from memory):

$stuff_in_lines = `grep suntide *.txt`;

I never thought about the potential for serious ambiguity in interpretation. 
The UNIX grep tool is really dissimilar considering that it uses a different 
regular expression syntax.

-->  Halloween  == Oct 31 == Dec 25 == Christmas  <--

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