In some North American dialects, all or a couple of the front vowels may be raised before velar nasal /ŋ/. In my dialect, I raise /ɛŋ/ and /æŋ/ to [eŋ] and /ɪŋ/ to [iŋ] if they're not across morpheme boundaries. (I made a chart of this here if you're interested in seeing more)
Since people rarely misspell "-ing" as "-eeng," I was curious as to how many spelling mistakes I could find for the more common /ɛŋ/ and /æŋ/ raising (and, merger) to [eŋ]. Since /ɛŋ/ and /æŋ/ merge, various different spellings could theoretically represent the resulting sound. For instance, if presented with these following spellings, I'd pronounce them all with [eŋ]:
With that in mind, I used ever-wonderful Google in seeing how many spelling mistakes I could find pointing to how prevalent the /ɛŋ/ and /æŋ/ merger and raising to [eŋ] was in different words. Here were my results:
hunger paings =124
Anyway, results like these should always be taken with a couple grains of salt but they still for the most part point to an intereting phenomenon. I love Google linguistic research!