P
>      Fix extraction of common prefixes from regular expressions (Tom Lane)
     </P
><P
>      The code could get confused by quantified parenthesized
      subexpressions, such as <TT
CLASS="LITERAL"
>^(foo)?bar</TT
>.  This would lead to
      incorrect index optimization of searches for such patterns.
     </P
></LI
><LI
><P
>      Fix bugs with parsing signed
      <TT
CLASS="REPLACEABLE"
><I
>hh</I
></TT
><TT
CLASS="LITERAL"
>:</TT
><TT
CLASS="REPLACEABLE"
><I
>mm</I
></TT
> and
      <TT
CLASS="RE