Parsing a string, removing any NON alphanumeric characters using regex

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DotNetNewbie - 26 Feb 2008 23:20 GMT

Hi,

I want to parse a string, ONLY allowing alphanumeric characters and
also the underscore '_' and dash '-' characters.

Anything else in the string should be removed.

I think my regex is looking like:

^([\w\d_-])*$

Now if I have this code:

string username = "mrcsharpis_so_cool!!!";

How can I strip all the characters that I dont' want?

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Arne Vajhøj - 26 Feb 2008 23:28 GMT

> I want to parse a string, ONLY allowing alphanumeric characters and
> also the underscore '_' and dash '-' characters.
[quoted text clipped - 4 lines]
>
> ^([\w\d_-])*$

^[\w-]*$

should do - \w includes digits and underscore.

> Now if I have this code:
>
> string username = "mrcsharpis_so_cool!!!";
>
> How can I strip all the characters that I dont' want?

Try:

Regex.Replace(username, @"[^\w-]+", "")

Arne

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DotNetNewbie - 27 Feb 2008 15:39 GMT

> > I want to parse a string, ONLY allowing alphanumeric characters and
> > also the underscore '_' and dash '-' characters.
[quoted text clipped - 20 lines]
>
> Arne

Replace doesn't take only 2 arguements, that doesn't work?

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Arne Vajhøj - 28 Feb 2008 01:23 GMT

>>> I want to parse a string, ONLY allowing alphanumeric characters and
>>> also the underscore '_' and dash '-' characters.
[quoted text clipped - 14 lines]
>
> Replace doesn't take only 2 arguements, that doesn't work?

There are 3 arguments in the call I suggest.

And Regex.Replace does have such a method:

http://msdn2.microsoft.com/en-us/library/e7f5w83z.aspx

Arne

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Parsing a string, removing any NON alphanumeric characters using regex

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