 If the pattern is studied, the results of that are also output.
</P>
<P>
The <b>/D</b> modifier is a PCRE debugging feature, and is equivalent to
<b>/BI</b>, that is, both the <b>/B</b> and the <b>/I</b> modifiers.
</P>
<P>
The <b>/F</b> modifier causes <b>pcretest</b> to flip the byte order of the
fields in the compiled pattern that contain 2-byte and 4-byte numbers. This
facility is for testing the feature in PCRE that allows it to execute patterns
that were compiled on a host with a different endianness