\      Escapes special characters to literal and literal characters to special.

\w matches any alphanumerical character (word characters) including underscore (short for [a-zA-Z0-9_])
^ matches beginning of input (or new line with m flag).
$ matches end of input (or end of line with m flag).
. matches any character except a newline
+ is short for {1,}. Matches one or more times.


/^                          begin
ftp:\/\/(\w+:\w+@)          user:password
     ([0-9]{1,3}\.){3}      ddd. repeat 3
     [0-9]{1,3}             ddd
    |                       or
  (\:[0-9]{1,4})?           :port
  (\/\w*)*                   /w
$/                           end

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