diff options
Diffstat (limited to 'doc/src/sgml/client-auth.sgml')
| -rw-r--r-- | doc/src/sgml/client-auth.sgml | 16 |
1 files changed, 8 insertions, 8 deletions
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 <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> |