Here is my suggestion:
foreach $line (@arr) {
if ( $line =~ m{\s+\d+:\s+\d+\s*:(\S+:\S+:D\n?)$}g ) {
#do something
}
}
To clarify: Are you concerned of matching (0:0:D) i.e. as per your statement "which I am scanning for processes which have a ':D' appended to the back of the :0:0"? The current expression given by you matches
13: 5456 :0:0 14: 5444 :0:0 15: 5445 :0:0 16: 14682 :1:0:D
17: 5450 :0:0 19: 5453 :0:0 20: 14626 :0:0:D
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