Module:Check for unknown parameters/doc

This module may be appended to a template to check for uses of unknown parameters.

Basic usage
or to sort the entries in the tracking category by parameter with a preview error message

or for an explicit red error message

or to use hidden error messages which can be viewed in the HTML source and a preview error message

Here,,  , ...,  , 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  parameter. The  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 1.

Regular expressions
This module supports regular expressions, which are useful when there are many known parameters which use a systematic pattern. For example, template:infobox3cols uses to match all parameters of the form,  ,  ,  ,  ,  , ...,  , where NUM is a string of digits.
 * regexp1 = header[%d][%d]*
 * regexp2 = label[%d][%d]*
 * regexp3 = data[%d][%d]*[abc]?
 * regexp4 = class[%d][%d]*[abc]?
 * regexp5 = rowclass[%d][%d]*
 * regexp6 = rowstyle[%d][%d]*
 * regexp7 = rowcellstyle[%d][%d]*

Example
<!-- ==Templates invoking this module==

The following is a list of templates which invoke this module, with the associated category for each.