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# load values into %config, template into $string, then...
1 while $string =~ s/\[%\s*(\S+)\s*%\]/$config{$1}/;

# load values into e.g. $CONFIG::variable1, etc., then...
$string = eval "package CONFIG;\n<<END_TEMPLATE;\n".$string."\nEND_TEM
+PLATE\n";