Question

127

Regex to disallow all Special Chars but allow German Umlauts in jQuery?

rated 0 times [ 129] [ 2] / answers: 1 / hits: 29599 / 11 Years ago, mon, june 17, 2013, 12:00:00

I would like to allow all Alphanumeric Characters and disallow all Special Characters in a RegEx. But I would like to allow German Umlauts but becouse they are Special Chars too, I can't type them in. I use this Script:

    if(website_media_description.match(/[^a-zA-Z0-9]/g)) { 



    alert('Found Special Char');        



}

So when a äöüÄÖÜß is in the variable than I get the alert too. I also tryed this Script:

    if(website_media_description.match(/[^a-zA-Z0-9äöüÄÖÜß]/g)) { 



    alert('Found Special Char');        



}

But this also does not work. Can someone please tell me what I am doing wrong?

Thanks :)

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allanw

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4 Years ago

answered 11 Years ago beatriceisabelad · Accepted Answer

my test String comes from an input field, i write description test 1 öäüÖÄÜß

Your problem is coming from the fact you haven't considered every character you want in your whitelist.

Let's consider what is actually matched by your test string

description test 1 öäüÖÄÜß.match(/[^a-zA-Z0-9äöüÄÖÜß]/g);

// [ ,  ,  ]

As we can see, it matched 3 times, and each time was whitespace. So, the solution is to add a space to your whitelist (assuming you don't want to allow tab/return etc).

description test 1 öäüÖÄÜß.match(/[^a-zA-Z0-9äöüÄÖÜß ]/g);

// null

Your test string now passes the RegExp without a match, which means it is valid in this case.