^start of string
Group Field1(?<Field1>[^ ]*) Negated Character Class[^ ]* *matches any number of characters outside the set below:
the literal (3210 / 408 / 2016)
\sany whitespace character
-the literal - (4510 / 558 / 2D16)
\sany whitespace character
Group Field2(?<Field2>[^ ]*) Negated Character Class[^ ]* *matches any number of characters outside the set below:
the literal (3210 / 408 / 2016)
\sany whitespace character
-the literal - (4510 / 558 / 2D16)
\sany whitespace character
Group Field3(?<Field3>.*) .*any character (except for line terminators), repeated any number of times
g modifier: global. Finds all matches instead of stopping after the first