Wims commented on a Page, Ask.com  -  Nov 08, 2011

he already did (although '\v' shouldn't be included there)Indeed! I quickly pasted something from wikipedia, but it was about POSIX character class, my bad, here is a quote from pcre.txt:
For compatibility with Perl, \s does not match the VT character (code
11). This makes it different from the the POSIX "space" class. The \s
characters are HT (9), LF (10), FF (12), CR (13), and space (32). If
"use locale;" is included in a Perl script, \s may match the VT charac-
ter. In PCRE, it never does.

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