What would be a pattern that matches:

Something like this should do the trick

my $re = qr/\s -D?jetty\.home= (.+?) (?:\s|$) /x;

/$re/ and print "yup - $1"
  for q[-Dname1=2 -Dname2.3="anything" -jetty.home="c:\a\b\c"],
      q[-Dname1=2 -Dname2.3="anything" -Djetty.home=c:\a\b\c]

__output__

yup - "c:\a\b\c"
yup - c:\a\b\c
[download]

See. perlre for more info.
HTH

_________
broquaint