Back-patch fix for extraction of fixed prefixes from regular expressions.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: dffc6c8a85e934a3633e0ba4c336830c2833e126
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2012-07-10T22:00:47Z
Releases: 9.0.9
Back-patch fix for extraction of fixed prefixes from regular expressions.

Back-patch of commits 628cbb50ba80c83917b07a7609ddec12cda172d0 and
c6aae3042be5249e672b731ebeb21875b5343010.  This has been broken since
7.3, so back-patch to all supported branches.

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