The \rules pragma adjusts the set of parser rules used to parse the remaining text.

\rules only|except <rule-list>

The list of available parser rules can be consulted in $:/ControlPanel -> Info -> Advanced -> Parsing.

For example, in stylesheets it is typical to only use the rules associated with macros and transclusions:

\rules only filteredtranscludeinline transcludeinline macrodef macrocallinline

Some users prefer not to use CamelCase links:

\rules except prettylink