17. Metacharacters - Review So Far

• So, thus far we know about:
  1. Use of [ and ] to create character classes
  2. Using ^ and - inside character classes to negate the class, or create a range
  3. Use of | to provide alternation
  4. Use of ( and ) to limit the scope of alternation
  5. Use of ^ and $ to match the beginning and the end of a line
  6. Use of . to match "any" character