[Mutt] #2886: inconsistent use of backslash in regexps

[Mutt <fleas@xxxxxxxx>]

#2886: inconsistent use of backslash in regexps

 If I want to match the + character from the index, I need to write, e.g.
   ~Bc\\+\\+
 (with two backslashes before the +). But from the pager, I need to search
 for:
   c\+\+
 with a single backslash this time.

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Ticket URL: <http://dev.mutt.org/trac/ticket/2886>