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my $found = substr $tmp, rindex($tmp, "\n")+1;
print "$found\n";

my $tmp = "1: 2\n2: /my/tmp/20160213T161519/outgoing\n3: DL\n4: 0\nTem
+pSource: , Ue: 2, TaskName=, TempDest: \nTaskName \n/data/busybox/ps 
+|grep mgen5| grep -v grep\nDL txt is running PID: 3848\nRunning:Mgen:
+3848";

...
@substr{@fields} = $tmp =~ m/\n(Running:(([^:]+):(\d+)))(?:\D|$)/;
 
printf "%-12s[%s]\n", $_, $substr{$_} for @fields;

All         [Running:Mgen:3848]
Value       [Mgen:3848]
Name        [Mgen]
Process_ID  [3848]