Re^3: code explanation

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Re^4: code explanation by Anonymous Monk on May 21, 2009 at 14:21 UTC
the match operator is documented in perlop, and regular expressions are documented in perlre, perlretut... Read perlintro use YAPE::Regex::Explain; print YAPE::Regex::Explain->new(qr/^\.{1,2}$/)->explain; __END__ The regular expression: (?-imsx:^\.{1,2}$) matches as follows: NODE EXPLANATION ---------------------------------------------------------------------- (?-imsx: group, but do not capture (case-sensitive) (with ^ and $ matching normally) (with . not matching \n) (matching whitespace and # normally): ---------------------------------------------------------------------- ^ the beginning of the string ---------------------------------------------------------------------- \.{1,2} '.' (between 1 and 2 times (matching the most amount possible)) ---------------------------------------------------------------------- $ before an optional \n, and the end of the string ---------------------------------------------------------------------- ) end of grouping ---------------------------------------------------------------------- [download]	[reply] [d/l]
Re^4: code explanation by jorgegv (Novice) on May 21, 2009 at 15:51 UTC
That is a basic regular expression. The instruction basically skips to the next iteration if the name of the element read matches the expression. This expression is: ^: Beginning of line... \.: a literal '.'... {1,2}: ...repeated once or twice $ end of line It skips the iteration if it finds files or directories with the name "." or "..".	[reply]