\v is not the vertical tab. It matches the character class of "vertical whitespace". The characters belonging to this class are listed in perlrecharclass as: 

LINE FEED
LINE TABULATION
FORM FEED
CARRIAGE RETURN
NEXT LINE
LINE SEPARATOR
PARAGRAPH SEPARATOR

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So actually \R matches all single vertical space characters and the two character sequence CR LF. This includes all common line endings.

Greetings,
-jo

$gryYup$d0ylprbpriprrYpkJl2xyl~rzg??P~5lp2hyl0p$

In reply to Re^4: Making $ Unicode-aware by jo37
in thread Making $ Unicode-aware by jo37

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