Hello again thanos1983,

Glad to see from the final update that you’ve got the solution you were looking for. One point: in the regex

/.xls$/
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Perl treats the dot as a metacharacter which means “Match any character (except newline)”.¹ So the regex matches a file name ending in the letters “xls” preceded by any character. To match a full stop only, you need to backslash it:

/\.xls$/
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In most cases, this won’t make any difference to your results, but if you happened to have a file named “abcxls” this would currently be matched incorrectly.

¹See “Metacharacters” in perlre#Regular-Expressions.

Hope that helps,