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 <h1 class="topictitle1">Adding pattern facets to simple types</h1>


 <div><p>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.</p>

 <div class="section"><p> The value of the pattern is called a regular expression. You
 can specify it using the <span class="uicontrol">Regular Expression</span> wizard.</p>
 <p>To
 add a pattern to a simple type, follow these steps:</p>
 </div>

 <ol>
 <li class="stepexpand"><span>In the Graph view, select the simple type you want to work with.</span>
 </li>

 <li class="stepexpand"><span>In the Properties view, click the <span class="uicontrol">Constraints</span> tab,
 then the <span class="uicontrol">Patterns</span> radio button.</span></li>

 <li class="stepexpand"><span>Click <span class="uicontrol">Add...</span>.</span> The Regular Expression
 Wizard opens.</li>

 <li class="stepexpand"><span>Select the token you want to add to the expression.</span></li>

 <li class="stepexpand"><span>Indicate how often you want the token to appear in order for a
 match to succeed.</span> If you want the token to repeat, click <span class="uicontrol">Repeat</span> 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 <span class="uicontrol">Range</span> and
 enter a minimum and maximum value.</li>

 <li class="stepexpand"><span>Click <span class="uicontrol">Add</span> to add the token to the regular
 expression.</span></li>

 <li class="stepexpand"><span>Repeat the previous three steps as necessary to create the entire
 expression.</span></li>

 <li class="stepexpand"><span>When you are finished, click <span class="uicontrol">Next</span>.</span>
 </li>

 <li class="stepexpand"><span>(Optional) Enter some sample text to test against the regular expression
 and see if a match occurs. </span></li>

 <li class="stepexpand"><span>Click <span class="uicontrol">Finish</span>.</span></li>

 </ol>

 <div class="section">The regular expression will appear in the Patterns page.</div>

 <div class="section">To edit an existing pattern, select it in the Patterns page and click <span class="uicontrol">Edit</span>.
 To delete an existing pattern, select it in the Patterns page and click <span class="uicontrol">Delete</span>. </div>

 </div>

 <div><div class="reltasks"><strong>Related tasks</strong><br />
 <div><a href="../topics/taddsmpt.html" title="Simple types are used to created derived datatypes. They provide a set of constraints on the value space (that is, a set of values) and the lexical space (that is, a set of valid literals) of a datatype.">Adding simple types</a></div>
 </div>
 </div>

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	<title>Adding pattern facets to simple types</title>
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	<body id="taddreg"><a name="taddreg"><!-- --></a>


	<h1 class="topictitle1">Adding pattern facets to simple types</h1>




	<div><p>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.</p>

	<div class="section"><p> The value of the pattern is called a regular expression. You
	can specify it using the <span class="uicontrol">Regular Expression</span> wizard.</p>
	<p>To
	add a pattern to a simple type, follow these steps:</p>
	</div>

	<ol>
	<li class="stepexpand"><span>In the Graph view, select the simple type you want to work with.</span>
	</li>

	<li class="stepexpand"><span>In the Properties view, click the <span class="uicontrol">Constraints</span> tab,
	then the <span class="uicontrol">Patterns</span> radio button.</span></li>

	<li class="stepexpand"><span>Click <span class="uicontrol">Add...</span>.</span> The Regular Expression
	Wizard opens.</li>

	<li class="stepexpand"><span>Select the token you want to add to the expression.</span></li>

	<li class="stepexpand"><span>Indicate how often you want the token to appear in order for a
	match to succeed.</span> If you want the token to repeat, click <span class="uicontrol">Repeat</span> 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 <span class="uicontrol">Range</span> and
	enter a minimum and maximum value.</li>

	<li class="stepexpand"><span>Click <span class="uicontrol">Add</span> to add the token to the regular
	expression.</span></li>

	<li class="stepexpand"><span>Repeat the previous three steps as necessary to create the entire
	expression.</span></li>

	<li class="stepexpand"><span>When you are finished, click <span class="uicontrol">Next</span>.</span>
	</li>

	<li class="stepexpand"><span>(Optional) Enter some sample text to test against the regular expression
	and see if a match occurs. </span></li>

	<li class="stepexpand"><span>Click <span class="uicontrol">Finish</span>.</span></li>

	</ol>

	<div class="section">The regular expression will appear in the Patterns page.</div>

	<div class="section">To edit an existing pattern, select it in the Patterns page and click <span class="uicontrol">Edit</span>.
	To delete an existing pattern, select it in the Patterns page and click <span class="uicontrol">Delete</span>. </div>

	</div>

	<div><div class="reltasks"><strong>Related tasks</strong><br />
	<div><a href="../topics/taddsmpt.html" title="Simple types are used to created derived datatypes. They provide a set of constraints on the value space (that is, a set of values) and the lexical space (that is, a set of valid literals) of a datatype.">Adding simple types</a></div>
	</div>
	</div>

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