This should work. But think hard about keeping comments and POD in the right place, e.g. either at the top of the file or before the sub to be commented. You might start with a 4-state state machine: 
start-of-file -> ??? -> sub-header
sub-header -> /^sub / -> in-sub
in-sub -> /^}$/ -> sub-header
sub-header -> eof() || /^__(END|DATA)__$/ -> end-of-file

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And remember to save that last non-empty "sub-header" when you reach EOF.

In reply to Re^2: Meta-perl - sorting my perl subs with perl? by educated_foo
in thread Meta-perl - sorting my perl subs with perl? by Syndaryl

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