A period exists mid-sentence
- A period represents any character.
- A pattern is either a single character, or a group of characters inside a set of parenthesis
- A pattern repeated one or more times is represented by the asterisk character + following the pattern: eg1: a+ would match a or aaaa. eg2: (ab)+ would match ab or ababab
- a period needs to be escaped "\." or it can be inside square brackets "[.]"