Use of _ in string causes sdssplitlen() to return no tokens

Thank you for a fantastic library!!

One minor possible issue:

I am using sdssplitlen() to parse out the elements of a path+file string, as in:
/DIR1/DIR2/this_isafile.txt <-- cTempString

tokens = sdssplitlen(cTempString,sdslen(cTempString),"/",1,&count);

With an underscore in the string, sdssplitlen() returns NULL.

Haven't single-step debugged it yet. For now, avoiding using filenames with _