# $text is the main text you want to process
# $begin is the begin keyword
# $end is the end keyword

$text =~ s/\Q$begin\E.*\Q$end\E//s;
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the '\Q' and '\E' around '$begin' and '$end' quote them so that even if they contain regexp characters, they won't do unexpected things. see the perlre manpage. of course, i'm sure someone will point out that dotstar is bad, but the question was pretty vague.

anders pearson