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    <p>First of all, there is no "best" way. There's just the "right" way which depends on the concrete functional requirements. </p> <p>The normal approach to validate in JSF is to use one of the <a href="http://docs.oracle.com/javaee/6/javaserverfaces/2.1/docs/vdldocs/facelets/" rel="nofollow noreferrer">standard validators available via <code>&lt;f:validateXxx&gt;</code> tags</a>, or to <a href="https://stackoverflow.com/questions/6047866/how-to-perform-validation-in-jsf-how-to-create-a-custom-validator-in-jsf">create a class which implements the Validator interface</a> if the desired functionality is not available in the standard tags. An alternative would be to validate by JavaScript as you suggested yourself, but this completely defeats the <a href="https://stackoverflow.com/questions/4013410/jsf2-validation-clientside-or-serverside">robustness of server-side validation</a> because JavaScript code is under full control by the enduser and thus editable/spoofable/disablable by the enduser.</p> <p>In your particular case, you want to validate the input whether it matches a regular pattern. In that case, the <code>&lt;f:validateRegex&gt;</code> is thus the right tag for the job. </p> <p>As to the actual regular pattern, any number between 1 and 9 is in regex represented by <code>[1-9]</code> and any alphabetic character between A and Z is in regex represented by <code>[A-Z]</code> (case sensitive! if you intend to allow lowercase as well, use <code>[a-zA-Z]</code>). Any "zero or one occurrence" like as the last number is in regex represented by <code>(...)?</code> whereby the <code>...</code> is to be substituted with the actual pattern. The remainder, the characters <code>/</code> and <code>-</code> can be represented as-is as long as those are no special characters in regex such as <code>.</code>, <code>(</code>, etc, otherwise they needs to be escaped with <code>\</code>.</p> <p>So, all in all, this should do:</p> <pre><code>&lt;h:inputText&gt; &lt;f:validateRegex pattern="[1-9]/[A-Z]-[1-9]-[1-9]-[1-9](-[1-9])?" /&gt; &lt;/h:inputText&gt; </code></pre> <h3>See also:</h3> <ul> <li><a href="http://www.regular-expressions.info/" rel="nofollow noreferrer">Regex tutorial</a></li> <li><a href="http://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html" rel="nofollow noreferrer"><code>java.util.regex.Pattern</code> javadoc</a></li> </ul>
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