s
found, this will be the same as the beginning of the current match.
If no match was found, then it indicates the earliest point at which a
match might occur if additional text is appended to the string.  If it
is no match is possible even with further text, this field will be set
to -1.
<H3><A NAME="M19">SEE ALSO</A></H3>
<B><A HREF="../TclCmd/re_syntax.html">re_syntax</A></B>
<H3><A NAME="M20">KEYWORDS</A></H3>
<A href="../Keywords/M.html#match">match</A>, <A href="../Keywords/P.html#pattern">pattern</A>