EXACTF EXACT, sv Match this string, folded (prec. by length).
EXACTFL EXACT, sv Match this string, folded in locale (w/len).
+# Trie Related (behave the same as A|LIST|OF|WORDS would)
+TRIE TRIE, trie 1 Match one or more of many EXACT strings
+TRIEF TRIE, trie 1 Match one or more of many EXACTF strings
+TRIEFL TRIE, trie 1 Match one or more of many EXACTFL strings
+
# Do nothing
NOTHING NOTHING,no Match empty string.
# A variant of above which delimits a group, thus stops optimizations