Regex for rewriting url to remove non-ascii characters

Hi,

I have this regular expression in a CMS that allows for urls with  Swedish characters å,ä,ö.

So for example a url for a page might look like this:

en-minnesavärd-äppeldag

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and the RegEx used inn the CMS looks like this:
[^\p{L}\-\!\$\(\)\=\@\d_\'\.]+|\.+$

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I would like it only to allow ascii so that the url would have to look like this instead:
en-minnesavard-appeldag

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How can I alter the RegEx to accomplish that?

Thanks for help!

Peter
Peter NordbergIT ManagerAsked:
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Terry WoodsIT GuruCommented:
Swap the \p{L} for a-zA-Z :

[^a-zA-Z\-\!\$\(\)\=\@\d_\'\.]+|\.+$
ozoCommented:
[^a-zA-Z\-\!\$\(\)\=\@\d_\'\.]+|\.+$
Peter NordbergIT ManagerAuthor Commented:
Hi and thanks for answer,

This makes a url  like this:
nya-äppelträd-växer-i-trädgården

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to look like this:
nya-ppeltr-d-v-xer-i-tr-dg-rden

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Is it possible to get it å, ä to be replaces with a and ö to be raplaced with o?

Peter
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Terry WoodsIT GuruCommented:
Do you mean with a regex, or will a custom function be ok?
Peter NordbergIT ManagerAuthor Commented:
With RegEx because I don't know how to impolement it with a custom function in this scenario.

Peter
Terry WoodsIT GuruCommented:
Apparently those characters are called "diacritics".

I can't see how to do that with a regex. If you'd like an alternative technique, apparently this works:

string initial = "ÁÂÃÄÅÇÈÉàáâãäåèéêëìíîïòóôõ";
string normal = initial.Normalize(NormalizationForm.FormD);
 
var withoutDiacritics = normal.Where(
    c => CharUnicodeInfo.GetUnicodeCategory(c) != UnicodeCategory.NonSpacingMark);
 
string final = new string(withoutDiacritics.ToArray());
 
Console.WriteLine(initial);
Console.WriteLine(final);
 
/* OUTPUT
 
ÁÂÃÄÅÇÈÉàáâãäåèéêëìíîïòóôõ
AAAAACEEaaaaaaeeeeiiiioooo
 
*/

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Source: http://www.blackwasp.co.uk/RemoveDiacritics.aspx

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Regular Expressions

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