With some initial testing with Gan, Hakka, Manadarin and Catonese
chars you can use a simple regex that will not match on the multibyte
chars. Something like this:
Hope it may help or at least give you a starting point
function englishOnlyChars() {
var matchString = new RegExp("[a-zA-Z0-9]");
if (document.myForm.test.value.match(matchString))
{
// contains ASCII chars, probably safe to assume not mixed with
multibyte chars
return true
}
else
{
// No ASCII chars found at all, tsk tsk
return false
}
}
Robert Bailey
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