splitting, matching. It is independent from the Str library, and can
replace Str in many cases. Unlike Str, xstr is thread-safe. xstr does
not implement regular expressions in general, but an important subset.
Some operations of xstr are performed as quickly as by Str; if the string
to be processed is small, xstr is often faster than Str; if the string is
big, xstr is upto half as fast than Str.
Author: Gerd Stolpmann <gerd@gerd-stolpmann.de>
WWW: http://www.ocaml-programming.de/packages/
PR: ports/101032
Submitted by: Stanislav Sedov <ssedov at mbsd.msk.ru>
