Info</B> are value interfaces that provide the most
direct control of Henry Spencer's regular expression library.  For
users that need to modify compilation and execution options directly,
it is recommended that you use these interfaces instead of calling the
internal regexp functions.  These interfaces handle the details of UTF
to Unicode translations as well as providing improved performance
through caching in the pattern and string values.
<P>
<B>Tcl_GetRegExpFromObj</B> attempts to return a compiled reg