Counting Search 2

Counting Search 1 asked how many times "ing" appears in a given String. In this challenge, you need to count how many words in a String end with "ing" or "ings" (lowercase), but ignore other appearances of "ing". The end of a word are any characters that do not have a letter right after them, but they can have punctuation.

For example, the following sentence contains 4 "ing" words.

                    1       2        3       4 
Pringle was searching on Bing for Singing Kings.

Note that "Singing" only counts once, and "Pringle" doesn't count at all.