This will probably do it.
btw, You might want your die msgs to include the $! variable to see why your file ops failed.
The .*? was the tricky part. (Non greedy matching.)
#!/usr/bin/perl -w
use strict;
open(IN,$ARGV[0]) or die ("$! : couldn't open $ARGV[0] for reading\
+n");
# slurp whole file into $text
local $/ =undef;
my $text=<IN>;
close(IN) or die "$! : couldn't close $ARGV[0]\n";
# assume no nesting of tags
$text=~s/(BEGTITLE.*?)wirey(.*?ENDTITLE)/$1smooth$2/gsi;
open(OUT,'>',$ARGV[1]) or die ("$! : couldn't open $ARGV[1] for writin
+g");
print OUT $text;
close(OUT) or die "$! couldn't close $ARGV[1]\n";
email: mandog
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