/**
* returns a <code>TextStore</code> which contains submatches, if any, pertaining to the most
* recent match. The object returned should be treated read-only. Its contents are only valid
* until the next match operation.
*
* @throws IllegalStateException if the most recent application of <code>this</code> did not yield
* a match.
*/
public TextStore submatches() {
if (a == null || a == DfaRun.EOF) {
throw new IllegalStateException("no recent match available");
}
if (!analyzed) {
analyzed = true;
ts.clear();
ts.appendPart(out, 0, out.length());
smd.analyze(ts, a);
}
return ts;
}