There is a POSIX macro for this: [:ascii:]. That is NOT a character class in and of itself -- it must be used IN a character class: 
if ($string =~ /[^[:ascii:]]/) {
  # a non-ASCII character was found!
}

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japhy -- Perl and Regex Hacker

In reply to Re: Re: Re: How do I determine if a string contains non ascii characters by japhy
in thread How do I determine if a string contains non ascii characters by Anonymous Monk

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