Change 13376 by jhi@alpha on 2001/11/30 01:16:22
Add a note about folding vs lowercase.
Affected files ...
.... //depot/perl/regexec.c#209 edit
Differences ...
==== //depot/perl/regexec.c#209 (text) ====
Index: perl/regexec.c
--- perl/regexec.c.~1~ Thu Nov 29 18:30:05 2001
+++ perl/regexec.c Thu Nov 29 18:30:05 2001
@@ -959,6 +959,14 @@
if (do_utf8) {
STRLEN len;
+ /* The ibcmp_utf8() uses to_uni_fold() which is more
+ * correct folding for Unicode than using lowercase.
+ * However, it doesn't work quite fully since the folding
+ * is a one-to-many mapping and the regex optimizer is
+ * unaware of this, so it may throw out good matches.
+ * Fortunately, not getting this right is allowed
+ * for Unicode Regular Expression Support level 1,
+ * only one-to-one matching is required. --jhi */
if (c1 == c2)
while (s <= e) {
if ( utf8_to_uvchr((U8*)s, &len) == c1
End of Patch.
