codeguy/Slim — pull request #718 by mcuelenaere (2013-12-28 12:16:45+00:00)
Title: Allow all valid characters in function names of getCallableAsClass

This uses the [a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]* regex as specified by https://php.net/manual/en/functions.user-defined.php