Created attachment 89697 [details] [review]
patch to add regexp-based filtering

Created attachment 89699 [details]
test application

It only allows to enter IPv4 addresses in the entry

Like the feature.  Thanks for implementing it.  Though can you explain a bit how it works?  What happens if, say, you try to edit the text content in the middle as opposed to the end?

I've used g_match_info_is_partial_match() to implement the feature, so any edition to the entry that leaves a partial match is allowed, but when there is no possibility of matching the regex pattern, no edition happens and gtk_widget_error_bell() is called.

So, for example, given you have the pattern "^(\d){1,3}[a-z](\d){1,3}$" and the "123a4" text (which matches the regex):

- deleting "a4" gives you a partial match
- deleting "23" still gives you a match
- deleting "a" won't be allowed, as "1234" doesn't match the pattern
- deleting "3a" gives you a partial match

*** This bug has been marked as a duplicate of bug 50276 ***