Is it acceptable in formal American English to pronounce the first vowel in regret, realize, and return with /ɛ/ as in DRESS¹, as opposed to with /i/ as in FLEECE²?
- DRESS /ɛ/: the open-mid front unrounded vowel
- FLEECE /i:/ or /ɪ/: the close front unrounded vowel
Also, how were these words pronounced in Middle English?