better help message for regex_old

extra/Configs/Config.in

@@ -1045,14 +1045,19 @@ config UCLIBC_HAS_REGEX
 	  only be included in your apps if you use regular expressions.
 
 config UCLIBC_HAS_REGEX_OLD
-	bool "Use the older (stable) Regular Expression Support"
+	bool "Use the older (stable) regular expression code"
 	depends on UCLIBC_HAS_REGEX
 	default y
 	help
-	  POSIX regular expression code is really big -- 27k all by itself.
+	  There are two versions of regex.  The older (stable) version has
-	  If you don't use regular expressions, turn this off and save space.
+	  been in uClibc for quite a long time but hasn't seen too many
-	  Of course, if you only staticly link, leave this on, since it will
+	  updates.  It also has some known issues when dealing with uncommon
-	  only be included in your apps if you use regular expressions.
+	  corner cases and multibyte/unicode strings.  However, it is quite
+	  a bit smaller than the newer version.
+
+	  If the older version has worked for you and you don't need unicode
+	  support, then stick with the old version (and say Y here).
+	  Otherwise, you should use the new version (and say N here).
 
 config UCLIBC_HAS_WORDEXP
 	bool "Support the wordexp() interface"