Minor editorialization on example --- I think that the use of dollar

quoting in this case is just needless obscurantism.

diff --git a/doc/src/sgml/ref/create_domain.sgml b/doc/src/sgml/ref/create_domain.sgml
index 7cf6b4de3856d9f4218d14eb210ea047fb66365a..2830d09cb5dd27f57b66b93ccac46494c6adeb98 100644 (file)
--- a/doc/src/sgml/ref/create_domain.sgml
+++ b/doc/src/sgml/ref/create_domain.sgml
@@ -1,5 +1,5 @@
 
 
@@ -161,14 +161,14 @@ where constraint is:
 
   
    This example creates the us_postal_code data type and
-    then uses the type in a table definition:
+   then uses the type in a table definition.  A regular expression test
+   is used to verify that the value looks like a valid US postal code.
 
 
 CREATE DOMAIN us_postal_code AS TEXT
-NOT NULL
 CHECK(
-   VALUE ~ $pc$^\d{5}$$pc$
-OR VALUE ~ $pc$^\d{5}-\d{4}$$pc$
+   VALUE ~ '^\d{5}$'
+OR VALUE ~ '^\d{5}-\d{4}$'
 );
 
 CREATE TABLE us_snail_addy (
@@ -177,7 +177,7 @@ CREATE TABLE us_snail_addy (
 , street2 TEXT
 , street3 TEXT
 , city TEXT NOT NULL
-, postal us_postal_code
+, postal us_postal_code NOT NULL
 );