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wget http://www.astro.sunysb.edu/fwalter/AST389/TEXTS/Nightfall.htm
html2text-cpp Nightfall.htm >nightfall.txt
for i in {1..1000}; do cat nightfall.txt >>in.txt; done

#!/bin/bash

...
    sed 's/ used.* / use /gi' | \
    sed 's/ using.* / use /gi' \
>|out-sed.dat

% time ./re.sh 
real    0m5,201s
user    0m43,394s
sys    0m1,302s

#!/usr/bin/perl
use strict;
...
    print $OUT "$_\n";
  }
}

% time ./re1.pl 
real    4m1,655s
user    4m29,242s
sys    0m0,380s

% time ./re2.pl 
real    1m5,096s
user    1m11,889s
sys    0m0,524s