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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 2a3a396432
commit 5fe55a0fe4
2 changed files with 21 additions and 21 deletions
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16
doc/src/sgml/client-auth.sgml
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@ -1003,8 +1003,9 @@ 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
@ -1022,12 +1023,11 @@ mymap /^(.*)@otherdomain\.com$ guest
<para>
If the <replaceable>database-username</replaceable> field starts with
a slash (<literal>/</literal>), 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). It is not possible to use <literal>\1</literal>
to use a capture from regular expression on
<replaceable>system-username</replaceable> for a regular expression
on <replaceable>database-username</replaceable>.
as a regular expression.
When the <replaceable>database-username</replaceable> field is a regular
expression, it is not possible to use <literal>\1</literal> within it to
refer to a capture from the <replaceable>system-username</replaceable>
field.
</para>
<tip>