^start of line
\d+a digit, repeated at least once
:the literal : (5810 / 728 / 3A16)
\s+any whitespace character, repeated at least once
\S+any non-whitespace character, repeated at least once
\s+any whitespace character, repeated at least once
Negative Lookahead(?!\1$) \1the text saved by group 1
$end of line
\S+any non-whitespace character, repeated at least once
$end of line
g modifier: global. Finds all matches instead of stopping after the first
m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string