regcomp.c: Generate EXACTFU_SS only for non-UTF8

It turns out that now, the regular methods for handling multi-character
folds work for the ones involving LATIN SMALL LETTER SHARP S when the
pattern is in UTF-8.  So the special code for handling this case can be
removed, and a regular EXACTFU node is generated.  This has the
advantage of being trie-able, and requiring fewer operations at run
time, as the pattern is pre-folded at compile time, and doesn't have to
be re-folded during each backtracking at run-time.

This means that the EXACTFU_SS node type will only be generated for
non-UTF-8 patterns, and the handling of it is unchanged in these cases.

1 files changed, 1 insertions, 1 deletions

diff --git a/regnodes.h b/regnodes.h
index 94b444379c..9fd01a70fc 100644
--- a/regnodes.h
+++ b/regnodes.h
@@ -53,7 +53,7 @@
 #define	EXACTFL               	39	/* 0x27 Match this string using /il rules (w/len); (string not guaranteed to be folded). */
 #define	EXACTFU               	40	/* 0x28 Match this string using /iu rules (w/len); (string folded iff in UTF-8; non-UTF8 folded length <= unfolded). */
 #define	EXACTFAA              	41	/* 0x29 Match this string using /iaa rules (w/len) (string folded iff in UTF-8; non-UTF8 folded length <= unfolded). */
-#define	EXACTFU_SS            	42	/* 0x2a Match this string using /iu rules (w/len); (string folded iff in UTF-8; non-UTF8 folded length > unfolded). */
+#define	EXACTFU_SS            	42	/* 0x2a Match this string using /iu rules (w/len); (string not UTF-8, only portions guaranteed to be folded; folded length > unfolded). */
 #define	EXACTFLU8             	43	/* 0x2b Like EXACTFU, but use /il, UTF-8, folded, and everything in it is above 255. */
 #define	EXACTFAA_NO_TRIE      	44	/* 0x2c Match this string using /iaa rules (w/len) (string not UTF-8, not guaranteed to be folded, not currently trie-able). */
 #define	EXACT_ONLY8           	45	/* 0x2d Like EXACT, but only UTF-8 encoded targets can match */