Another WTDI would be to use sprintf, if only to make the code more readable: my $fmt = '<section id="ch%02dfm" label="" xreflabel="" role="fm">';
# ..later..
$_ =~ s/<CT>/sprintf $fmt, $acno/ge;
I guessed at the %02d in the format string based on your sample.
BTW, the default target for the substitution is $_ so you could actually shorten the assignment to just s/<CT>/sprintf $fmt, $acno/ge;
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