Missing 'include' option

[martin-langhoff]

In some cases, the activity that's interesting for fsnotify happens in specific subdirectories. An include regex would support this, and mirror exclude. Linked to #18

In the interim, I am using a fugly regex with negative look-ahead assertions to (ab)use the 'exclude' option to make it work as an 'include'...

[Carpenter0100]

could you share your regex? :D