Fix psql \d commands to behave properly when a pattern using regex | is given.
Formerly they'd emit '^foo|bar$' which is wrong because the anchors are
parsed as part of the alternatives; must emit '^(foo|bar)$' to get expected
behavior. Same as bug found previously in similar_escape(). Already fixed
in HEAD, this is just back-porting the part of that patch that was a bug fix.
describe.c (r18.104.22.168 -> r22.214.171.124)
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|Subject: pgsql: Fix psql \d commands to behave properly when a pattern using |