rovided with the option name. If this capture contains any character then the following capture is used as the option's value, otherwise the next argument is used as the option value if necessary.</li>
			<li><code>value</code>: command-line option value. This capture is only processed if the previous capture evaluates to a non-empty string.</li>
		</ol>
		The default value for this field is <code>"^%-(%w+)(=?)(.-)$"</code>.
	</dd>
	
	<dt><code><b>_unknown</b></code></dt>
	<dd>
		String that defines the for