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Minor editorialization on example --- I think that the use of dollar
quoting in this case is just needless obscurantism.
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@ -1,5 +1,5 @@
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<!--
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$PostgreSQL: pgsql/doc/src/sgml/ref/create_domain.sgml,v 1.18 2004/08/08 01:49:30 momjian Exp $
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$PostgreSQL: pgsql/doc/src/sgml/ref/create_domain.sgml,v 1.19 2004/08/08 02:05:32 tgl Exp $
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PostgreSQL documentation
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-->
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@ -161,14 +161,14 @@ where <replaceable class="PARAMETER">constraint</replaceable> is:
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<para>
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This example creates the <type>us_postal_code</type> data type and
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then uses the type in a table definition:
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then uses the type in a table definition. A regular expression test
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is used to verify that the value looks like a valid US postal code.
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<programlisting>
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CREATE DOMAIN us_postal_code AS TEXT
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NOT NULL
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CHECK(
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VALUE ~ $pc$^\d{5}$$pc$
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OR VALUE ~ $pc$^\d{5}-\d{4}$$pc$
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VALUE ~ '^\d{5}$'
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OR VALUE ~ '^\d{5}-\d{4}$'
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);
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CREATE TABLE us_snail_addy (
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@ -177,7 +177,7 @@ CREATE TABLE us_snail_addy (
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, street2 TEXT
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, street3 TEXT
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, city TEXT NOT NULL
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, postal us_postal_code
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, postal us_postal_code NOT NULL
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);
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</programlisting>
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</para>
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