sion, and subsequent elements
refer to the parenthesized subexpressions in the order that they
appear in the pattern.  Each element is a structure that is defined as
follows:
<P>
<PRE>typedef struct Tcl_RegExpIndices {
    long <I>start</I>;
    long <I>end</I>;
} <B>Tcl_RegExpIndices</B>;</PRE>
<P>
The <I>start</I> and <I>end</I> values are Unicode character indices
relative to the offset location within <I>objPtr</I> where matching began.
The <I>start</I> index identifies the first character of the matche