The x option indicates that most white space should be ignored. That allows me to use spaces to break up the regex a little to make it easier to see where each field is.

The first field is captured by (\S+)\s+ which grabs the first sequence of non-space characters from the start of the line.

The second field is captured by ([^:]+):\s+ which matches and captures a sequence of characters excluding ':', then matches the ':' and any following white space.

The third field is a little more interesting. ((?:(?!\s*\(rev).)+))\s* crawls along the remainder of the line matching and capturing one character at a time until it comes to '(rev' preceeded by any amount of white space. The (?:...) bit groups some stuff without capturing. The (?!...) bit looks ahead to make sure the following stuff doesn't match whatever '...' is. The '...' bit inside of (?:...) matches a single character so long as it's not the start of something that would match '\s*\(rev'.

The fourth field just picks up everything from '(Rev' to the end of the line.

In other words:

    m/ ^(\S+)    # Grab all non white space at the start into $1
         \s+         # Skip any white space
         ([^:]+)   # Now grab everything that isn't a colon in $2
         :            # End the grab for $2 at the colon 
         \s+        # Skip any white space
        (            # Going to capture into $3
        (?:         # Start non-capturing parens
        (?!         # Start negative lookahead
        \s*         # Look for some white space
        \(rev      # Followed by (rev
        )            # Close negative lookahead
       .)            # Close non-capturing parens
       +)           # So if whitespace followed by (rev, grab it $3
       \s*          # Up until some white space
      (.*)          # Grab everything else after the white space into 
+$4
            /x;
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I really just wanted to demonstrate to the OP how to powerfully use the /x modifier