zhaih commented on a change in pull request #225:
URL: https://github.com/apache/lucene/pull/225#discussion_r724693503
##########
File path: lucene/core/src/java/org/apache/lucene/util/automaton/RegExp.java
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@@ -551,12 +551,22 @@ static RegExp newLeafNode(
return new RegExp(flags, kind, null, null, s, c, min, max, digits, from,
to);
}
+ /**
+ * Return an <code>Automaton</code> from this <code>RegExp</code> that will
skip the determinize
+ * and minimize step
+ *
+ * @return {@link Automaton} most likely non-deterministic
+ */
+ public Automaton toNFA() {
Review comment:
I didn't read it carefully, but it's just using a systematic way I
think, similar to what stated here: https://swtch.com/~rsc/regexp/regexp1.html?
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