will remove the domain part for users with system user names that end with

<literal>@mydomain.com</literal>, and allow any user whose system name ends with

<literal>@otherdomain.com</literal> to log in as <literal>guest</literal>.

Quoting a <replaceable>database-username</replaceable> containing

<literal>\1</literal> <emphasis>does not</emphasis> make

<literal>\1</literal> lose its special meaning.

</para>

<tip>

[qr/connection authenticated: identity="$system_user" method=peer/]);

reset_pg_ident($node,'mypeermap',qq{/^$system_user(.*)\$},

'"test\1mapuser"');

test_role(

$node,

qq{testmapuser},

'peer',

0,

'with regular expression in user name map with quoted \1 replaced',

[qr/connection authenticated: identity="$system_user" method=peer/]);

reset_pg_ident($node,'mypeermap',qq{/^$system_user\$},'\1testmapuser');