From 5fe55a0fe40e801c77d8b2541caaaca49e67a75f Mon Sep 17 00:00:00 2001 From: Tom Lane Date: Tue, 15 Jul 2025 18:53:00 -0400 Subject: Doc: clarify description of regexp fields in pg_ident.conf. 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 Author: Tom Lane Reviewed-by: David G. Johnston Discussion: https://postgr.es/m/175206279327.3157504.12519088928605422253@wrigleys.postgresql.org Backpatch-through: 13 --- doc/src/sgml/client-auth.sgml | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) (limited to 'doc/src') diff --git a/doc/src/sgml/client-auth.sgml b/doc/src/sgml/client-auth.sgml index 832b616a7bb..51b95ed04f3 100644 --- a/doc/src/sgml/client-auth.sgml +++ b/doc/src/sgml/client-auth.sgml @@ -1003,8 +1003,9 @@ local db1,db2,@demodbs all md5 the remainder of the field is treated as a regular expression. (See for details of PostgreSQL's regular expression syntax.) The regular - expression can include a single capture, or parenthesized subexpression, - which can then be referenced in the database-username + 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 database-username field as \1 (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 If the database-username field starts with a slash (/), the remainder of the field is treated - as a regular expression (see - for details of PostgreSQL's regular - expression syntax). It is not possible to use \1 - to use a capture from regular expression on - system-username for a regular expression - on database-username. + as a regular expression. + When the database-username field is a regular + expression, it is not possible to use \1 within it to + refer to a capture from the system-username + field. -- cgit v1.2.3