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Language/Type: General regular expressions
Author: Melissa Hovik (on 2018/06/01)

Write a regular expression that will match each of the following patterns:

Lower-cased single words that start with "s" and end with "ion" or "ing".
Lower-cased single words that contain at least two occurrences of "oo" ("ooo" is also considered to match)
Strings of one or more space-separated words such that each word optionally ends with a single ",", ";" or ":" but the last word always ends with ".". Ignore letter-casing and only consider alphabetical characters for words.

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