This package implements frequent string operations: searching, replacing, 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 up to half as fast than Str. WWW: http://projects.camlcity.org/projects/xstr.html