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package NewSubst ; use Filter::Util::Call ; use Carp ; use strict ; use warnings ; sub import { my ($self, $start, $stop, $from, $to) = @_ ; my ($found) = 0 ; croak("usage: use Subst qw(start stop from to)") unless @_ == 5 ; filter_add( sub { my ($status) ; if (($status = filter_read()) > 0) { $found = 1 if $found == 0 and /$start/ ; if ($found) { s/$from/$to/ ; filter_del() if /$stop/ ; } } $status ; } ) } 1 ;
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