Regex Search for Month, DD, YYYY
You can use the below regular expression posted here by Veverke to search for dates in the 'Month, DD, YYYY' format - using the full spelling for the month. For example, 'July 4, 1976'.
(Jan(?:uary)?|Feb(?:ruary)?|Mar(?:ch)?|Apr(?:il)?|May|Jun(?:e)?|Jul(?:y)?|Aug(?:ust)?|Sep(?:tember)?|Oct(?:ober)?|Nov(?:ember)?|Dec(?:ember)?)\s+(\d{1,2})\,\s+(\d{4})
This will account for standard abbreviations of the month names, but it will need to be modified if those abbreviations are followed with a period.