in reply to
poll ideas quest 2007
Which backslash escape will be the last to get meaning in perl?
\F (Update 2015-06-08: \F is now used starting from perl 5.16.0)
\P (Update 08 aug 29: \P is used up, dunno how I messed this up.)
\o (Update 2010-11-24: remove: \o is now used starting from perl 5.13.3)
- some punctuation
- some control char
- some non-ascii
- another double meaning
- (Update:) third meaning for \1 or \b or \N (Update 2010-11-24: added \N for it too now has two meanings)
Don't worry, vim regexen are much worse.