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All the Perl that's Practical to Extract and Report

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  • Don’t look at the UTF8 flag. The UTF8 flag does not mean what you think it means. You can have a perfectly valid Unicode string that does not have its UTF8 flag set, and you can have a JPEG image in a string that does have its UTF8 flag set. The UTF8 flag is a lie. It should not have been called the UTF8 flag. There is no flag in Perl that means what you think the UTF8 flag means. Don’t look at the UTF8 flag.

    What you want to do is very simple:

    sub _is_valid_xml_string {
      $_[0] !~ /[^\x9\xA\