Editing Module:Check for unknown parameters/doc (section)

== Usage ==
=== Basic usage ===
<pre>
{{#invoke:check for unknown parameters|check
|unknown=[[Category:Some tracking category]]
|arg1|arg2|...|argN}}
</pre>
or to sort the entries in the tracking category by parameter with a preview error message
<pre>
{{#invoke:check for unknown parameters|check
|unknown=[[Category:Some tracking category|_VALUE_]]
|preview=unknown parameter "_VALUE_"
|arg1|arg2|...|argN}}
</pre>
or for an explicit red error message
<pre>
{{#invoke:check for unknown parameters|check
|unknown=<span class="error">Sorry, I don't recognize _VALUE_</span>
|arg1|arg2|...|argN}}
</pre>
or to use hidden error messages which can be viewed in the HTML source and a preview error message
<pre>
{{#invoke:check for unknown parameters|check
|unknown=<span class="error" style="display:none">HIDDEN ERROR: Usage of "_VALUE_" is not recognized</span>
|preview=unknown parameter "_VALUE_"
|arg1|arg2|...|argN}}
</pre>
Here, <code>arg1</code>, <code>arg2</code>, ..., <code>argN</code>, are the known parameters.  Any parameter which is used, but not on this list, will cause the module to return whatever is passed with the <code>unknown</code> parameter.  The <code>_VALUE_</code> keyword, if used, will be changed to the name of the parameter.  This is useful for either sorting the entries in a tracking category, or for provide more explicit information.

By default, the module makes no distinction between a defined-but-blank parameter and a non-blank parameter.  To only track non-blank parameters use {{para|ignoreblank|1}}.
=== Regular expressions ===
This module supports regular expressions, which are useful when there are many known parameters which use a systematic pattern.