Log Message:
-----------
Teach regex_fixed_prefix() the correct handling of advanced regex
escapes --- they aren't simply quoted characters.  Problem noted by
Antti Salmela.  Also fix problem with incorrect handling of multibyte
characters when followed by a quantifier.

Tags:
----
REL7_4_STABLE

Modified Files:
--------------
    pgsql/src/backend/utils/adt:
        selfuncs.c (r1.147.2.3 -> r1.147.2.4)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/selfuncs.c.diff?r1=1.147.2.3&r2=1.147.2.4)

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