4x3LDev

+-----------------+----------------------------------------------------------------------------------------------------------+
|  Metacharacter  |                                           Description                                                    |
+-----------------+----------------------------------------------------------------------------------------------------------+
|        \        | Specifies the next character as either a special character, literal, back reference, or an octal escape. |
|        ^        |    Matches the position at the beginning of the input string.                                            |
|        $        |    Matches the position at the end of the input string.                                                  |
|        *        |    Matches the preceding subexpression zero or more times.                                               |
|        +        |    Matches the preceding subexpression one or more times.                                                |
|