I>.
<I>Start</I> will be less than or equal to <I>text</I>;  if it
is less than <I>text</I> then no <B>^</B> matches will be allowed.
<P>
<B>Tcl_RegExpRange</B> may be invoked after <B>Tcl_RegExpExec</B>
returns;  it provides detailed information about what ranges of
the string matched what parts of the pattern.
<B>Tcl_RegExpRange</B> returns a pair of pointers in <I>*startPtr</I>
and <I>*endPtr</I> that identify a range of characters in
the source string for the most recent call to <B>Tcl_RegExpExec</B>.
<