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Doc: clarify description of regexp fields in pg_ident.conf.

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The grammar was a little shaky and confusing here, so word-smith it
a bit.  Also, adjust the comments in pg_ident.conf.sample to use the
same terminology as the SGML docs, in particular "DATABASE-USERNAME"
not "PG-USERNAME".

Back-patch appropriate subsets.  I did not risk changing
pg_ident.conf.sample in released branches, but it still seems OK
to change it in v18.

Reported-by: Alexey Shishkin <alexey.shishkin@enterprisedb.com>
Author: Tom Lane <tgl@sss.pgh.pa.us>
Reviewed-by: David G. Johnston <david.g.johnston@gmail.com>
Discussion: https://postgr.es/m/175206279327.3157504.12519088928605422253@wrigleys.postgresql.org
Backpatch-through: 13
This commit is contained in:
Tom Lane
2025-07-15 18:53:00 -04:00
parent 6c93bf735c
commit dc70816fde
1 changed files with 3 additions and 2 deletions
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5
doc/src/sgml/client-auth.sgml
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@@ -838,8 +838,9 @@ local db1,db2,@demodbs all md5
the remainder of the field is treated as a regular expression.
(See <xref linkend="posix-syntax-details"/> for details of
<productname>PostgreSQL</productname>'s regular expression syntax.) The regular
expression can include a single capture, or parenthesized subexpression,
which can then be referenced in the <replaceable>database-username</replaceable>
expression can include a single capture, or parenthesized subexpression.
The portion of the system user name that matched the capture can then
be referenced in the <replaceable>database-username</replaceable>
field as <literal>\1</literal> (backslash-one). This allows the mapping of
multiple user names in a single line, which is particularly useful for
simple syntax substitutions. For example, these entries