<?php
$text = file_get_contents("text.txt");
$text = preg_replace("/<(p|\/p)>/si","[\\1]",$text);
$text = preg_replace("/<(br|br \/)>/si","[\\1]",$text);
$text = preg_replace("/<[^>]+>/si","",$text);
$text = preg_replace("/\[(br|br \/)\]/si","<\\1>",$text);
$text = preg_replace("/\[(p|\/p)\]/si","<\\1>",$text);
echo $text;
?>
запускать из консоли:
php -f script.php > text_new.txt
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