\w+any word character, repeated at least once
:the literal : (5810 / 728 / 3A16)
.*?any character (except for line terminators), repeated any number of times
Positive Lookahead(?= \w+:|$) the literal (3210 / 408 / 2016)
\w+any word character, repeated at least once
:the literal : (5810 / 728 / 3A16)
$end of string, or before its final line terminator
g modifier: global. Finds all matches instead of stopping after the first