CANY no Match any one byte.
ANYOF sv 1 Match character in (or not in) this class,
single char match only
+ ANYOFL sv 1 Like ANYOF, but /l is in effect
# POSIX Character Classes:
POSIXD none Some [[:class:]] under /d; the FLAGS field
# Literals
EXACT str Match this string (preceded by length).
+ EXACTL str Like EXACT, but /l is in effect.
EXACTF str Match this non-UTF-8 string (not guaranteed
to be folded) using /id rules (w/len).
EXACTFL str Match this string (not guaranteed to be
UTF-8) using /iu rules (w/len).
EXACTFA str Match this string (not guaranteed to be
folded) using /iaa rules (w/len).
+
EXACTFU_SS str Match this string (folded iff in UTF-8,
length in folding may change even if not in
UTF-8) using /iu rules (w/len).
+ EXACTFLU8 str Rare cirucmstances: like EXACTFU, but is
+ under /l, UTF-8, folded, and everything in
+ it is above 255.
EXACTFA_NO_TRIE str Match this string (which is not trie-able;
not guaranteed to be folded) using /iaa
rules (w/len).