▄ GREP-like wildcards
 ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀
 ┌─────┬─────┬─────┬─────┬─────┬───────┬─────┐
 │  ^  │  $  │  .  │  *  │  +  │  [ ]  │  \  │
 └─────┴─────┴─────┴─────┴─────┴───────┴─────┘
 ────┬────────────────────────────────────────────────────────────────
  ^  │ A circumflex at the start of the string matches the start of a
     │   line.
  $  │ A dollar sign at the end of the expression matches the end of
     │   a line.
  .  │ A period matches any character.
  *  │ An asterisk after a character matches any number of occurrences
     │   (including zero) of that character.
     │   For example, bo* matches bot, b, boo, and also be.
  +  │ A plus sign after a character matches one or more occurrences
     │   (but not zero occurences) of that character.
     │   For example, bo+ matches bot and boo, but not b or be.
  [ ]│ Characters in brackets match any one character that appears in
     │   the brackets, but no others.
     │   For example [bot] matches b, o, or t.
  [^]│ A circumflex at the start of the string in brackets means NOT.
     │   Hence, [^bot] matches any characters except b, o, or t.
  [-]│ A hyphen within the brackets signifies a range of characters.
     │   For example, [b-o] matches any character from b through o.
  \  │ A backslash before a wildcard character tells Borland Pascal to
     │  treat that character literally, not as a wildcard.
     │  For example, \^ matches ^ and does not look for the start
     │  of a line.