Update confutils.php - linesToHash splitting

Current linesToHash splits using generic whitespace character.
For plugins like plugin:explain this causes an issue when combined with confmanager to edit config files.

Function now first checks for tab instead of just whitespace char to accommodate for the ability to use a space in the term.
Is the strpos() function already satisfying to perform this job? If you don't really use the power of a regexp, these kind of functions are more efficient. Or did I miss some details? 

http://php.net/manual/en/function.strpos.php

and what about using explode() over preg_split()?