Clever Geek Handbook

Detecting non-European characters

I need to prevent users from entering non-european characters in a textbox.

For example, here's how I disable Cyrillic:

$('.test').keyup(function(e) {
        var toTest = $(this).val();
        var rforeign = /[\u0400-\u04FF]/i;
        if (rforeign.test(toTest)) {
            alert("No cyrillic allowed");
            $(this).val('');
        } 
    });

But I also need to exclude Arabic, Japanese, etc.

I just want to allow:

  • ASCII English, standard characters
  • Italian accented letters: à è ì ò ù é é ó ó
  • other special characters from European languages: French, German ...

Is there a way to do this with ranges?

I tried it /[\u0400-\u04FF]/i

, but it just allows ASCII English (not Italian for example) to be used.

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2 answers


Just allow Unicode characters in the given range / s for example.

/^[a-z\u00C0-\u00F6\u00F8-\u017E]+$/i

Sample script: https://jsfiddle.net/4y6e6bj5/3/



This regex allows basic latin / latin extended A (diacritics and accented letters). It excludes any other character / character.

If you need to allow other specific unicode characters, look at the unicode table and insert as many ranges as you need into the regex

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Use negative set:



[^A-Za-zàèìòùáéíóú(othercharacters..)]
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