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I want to verify the syntax of a URL. How should I use regexes to test the validity of a URL like www.chaine.com?

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You can do it this way, without regex:

public boolean validateURI(String uri)
{
    try
    {
        new URI(uri);
        return true;
    } catch(Exception e)
    {
        return false; // MalformedURI Exception, is the name I think
    }
}

URL extends URI, you can say, I think...

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