Changed char_type to be the type used by the regex object not the iterator - allows code to compile where the iterator enumerates types that are different to the regex type.

[SVN r20228]

libs/regex

@@ -1 +1 @@
-Subproject commit 83306608a77109f053fd481f7bf21c7d4268c60b
+Subproject commit 182616ea25ec2e423f30dbae8c58fdb99e639361