Documentation for new -W regex support fails to mention length requirement

[schuelermine]

Documentation

-W will now support regex. The documentation says that “If it starts and ends with a forward slash (/)” the message field will be a regular expression. This is incorrect, there is an additional requirement that the field be at least two characters long. / is one character long and starts and ends with a forward slash, but it is not interpreted as a regex (it matches literal /).