s{
   ( ^ \#[ ]START \n )
   ( .*?             )
   ( ^ \#[ ]END   \n )
}{
   $1 . ( $2 =~ s/^[ $]*//rg ) . $3
}xsmeg;

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In reply to Re: s///g within m//g regions by ikegami
in thread s///g within m//g regions by almr

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