docs/org.eclipse.wst.xsdeditor.doc.user/topics/taddreg.dita

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<task id="taddreg" xml:lang="en-us">
<title>Adding pattern facets to simple types</title>
<titlealts>
<searchtitle>Adding pattern facets to simple types</searchtitle>
</titlealts>
<shortdesc>A pattern facet can be used to constrain the value of a type's
lexical space (the set of string literals that represent the values of a type),
which indirectly constrains the value space.</shortdesc>
<prolog><metadata>
<keywords><indexterm>XML schema editor<indexterm>adding<indexterm>pattern
facets</indexterm></indexterm></indexterm><indexterm>XML schema editor<indexterm>pattern
facets<indexterm>adding</indexterm></indexterm></indexterm><indexterm>XML
schema files<indexterm>adding<indexterm>pattern facets</indexterm></indexterm></indexterm>
<indexterm>XML schema files<indexterm>pattern facets<indexterm>adding</indexterm></indexterm></indexterm>
</keywords>
</metadata></prolog>
<taskbody>
<context><p> The value of the pattern is called a regular expression. You
can specify it using the <uicontrol>Regular Expression</uicontrol> wizard.</p><p>To
add a pattern to a simple type, follow these steps:</p></context>
<steps>
<step><cmd>In the Graph view, select the simple type you want to work with.</cmd>
</step>
<step><cmd>In the Properties view, click the <uicontrol>Constraints</uicontrol> tab,
then the <uicontrol>Patterns</uicontrol> radio button.</cmd></step>
<step><cmd>Click <uicontrol>Add...</uicontrol>.</cmd><info>The Regular Expression
Wizard opens.</info></step>
<step><cmd>Select the token you want to add to the expression.</cmd></step>
<step><cmd>Indicate how often you want the token to appear in order for a
match to succeed.</cmd><info>If you want the token to repeat, click <uicontrol>Repeat</uicontrol> and
specify the number of times the token must appear. If you want to specify
a minimum and maximum number of times the token can appear, click <uicontrol>Range</uicontrol> and
enter a minimum and maximum value.</info></step>
<step><cmd>Click <uicontrol>Add</uicontrol> to add the token to the regular
expression.</cmd></step>
<step><cmd>Repeat the previous three steps as necessary to create the entire
expression.</cmd></step>
<step><cmd>When you are finished, click <uicontrol>Next</uicontrol>.</cmd>
</step>
<step><cmd>(Optional) Enter some sample text to test against the regular expression
and see if a match occurs. </cmd></step>
<step><cmd>Click <uicontrol>Finish</uicontrol>.</cmd></step>
</steps>
<result>The regular expression will appear in the Patterns page.</result>
<postreq>To edit an existing pattern, select it in the Patterns page and click <uicontrol>Edit</uicontrol>.
To delete an existing pattern, select it in the Patterns page and click <uicontrol>Delete</uicontrol>. </postreq>
</taskbody>
</task>