Problem:
Match only dots in the following expressions in the output. Any character matched other than dot is illegal and won't make your regular expressions correct.
Output:
Solution:
\.
Side comments: Yes, simply. This is the solution. There is the concept of a wildcard, which is represented by the . (dot) metacharacter, and can match any single character (letter, digit, whitespace, everything). You may notice that this actually overrides the matching of the period, so in order to specifically match a period, you need to escape the dot by using a slash \. accordingly.
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