Added checks to message loading code.

Added extra members to RegEx class.
Updated docs accordingly.


[SVN r12244]

libs/regex

@@ -1 +1 @@
-Subproject commit e4138b5bdc0a5f1e57a7c0780a54df0dad2d8f99
+Subproject commit 52dbd281ca666478760dea1e114bca1f7b98f80a