31. Metacharacters - The Final Review

• At last! We're done with metacharacters. Now we know all 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 ) or \( and \) 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
  7. The ?, *, + and {min, max} quantifiers
• And also:
  1. Use of \ to escape metacharacters
  2. Using grouping to apply quantifiers to a sequence of literals
  3. Using grouping to access backreferences with \1, \2, ... or $1, $2, ...
  4. Using \< and \> or \b and \B to match word boundaries
  5. A bunch of Perl and POSIX specific metasequences