重写Jeff的代码，使其更简洁

    public static string RemapInternationalCharToAscii(char c)
    {
        var s = c.ToString().ToLowerInvariant();

        var mappings = new Dictionary<string, string>
        {
            { "a", "àåáâäãåą" },
            { "c", "çćčĉ" },
            { "d", "đ" },
            { "e", "èéêëę" },
            { "g", "ğĝ" },
            { "h", "ĥ" },
            { "i", "ìíîïı" },
            { "j", "ĵ" },
            { "l", "ł" },
            { "n", "ñń" },
            { "o", "òóôõöøőð" },
            { "r", "ř" },
            { "s", "śşšŝ" },
            { "ss", "ß" },
            { "th", "Þ" },
            { "u", "ùúûüŭů" },
            { "y", "ýÿ" },
            { "z", "żźž" }
        };

        foreach(var mapping in mappings)
        {
            if (mapping.Value.Contains(s))
                return mapping.Key;
        }

        return string.Empty;
    }

你也可以使用这个JavaScript函数在表单中生成鼻涕虫(这个是基于/从Django复制的):

function makeSlug(urlString, filter) {
    // Changes, e.g., "Petty theft" to "petty_theft".
    // Remove all these words from the string before URLifying

    if(filter) {
        removelist = ["a", "an", "as", "at", "before", "but", "by", "for", "from",
        "is", "in", "into", "like", "of", "off", "on", "onto", "per",
        "since", "than", "the", "this", "that", "to", "up", "via", "het", "de", "een", "en",
        "with"];
    }
    else {
        removelist = [];
    }
    s = urlString;
    r = new RegExp('\\b(' + removelist.join('|') + ')\\b', 'gi');
    s = s.replace(r, '');
    s = s.replace(/[^-\w\s]/g, ''); // Remove unneeded characters
    s = s.replace(/^\s+|\s+$/g, ''); // Trim leading/trailing spaces
    s = s.replace(/[-\s]+/g, '-'); // Convert spaces to hyphens
    s = s.toLowerCase(); // Convert to lowercase
    return s; // Trim to first num_chars characters
}

假设你的模型类有一个title属性，你可以简单地覆盖模型中的to_param方法，就像这样:

def to_param
  title.downcase.gsub(/ /, '-')
end

Railscast的这集有所有的细节。你也可以使用这个来确保标题只包含有效字符:

validates_format_of :title, :with => /^[a-z0-9-]+$/,
                    :message => 'can only contain letters, numbers and hyphens'

T-SQL实现，改编自dbo。UrlEncode:

CREATE FUNCTION dbo.Slug(@string varchar(1024))
RETURNS varchar(3072)
AS
BEGIN
    DECLARE @count int, @c char(1), @i int, @slug varchar(3072)

    SET @string = replace(lower(ltrim(rtrim(@string))),' ','-')

    SET @count = Len(@string)
    SET @i = 1
    SET @slug = ''

    WHILE (@i <= @count)
    BEGIN
        SET @c = substring(@string, @i, 1)

        IF @c LIKE '[a-z0-9--]'
            SET @slug = @slug + @c

        SET @i = @i +1
    END

    RETURN @slug
END

下面是我的(稍慢，但写起来很有趣)Jeff的代码版本:

public static string URLFriendly(string title)
{
    char? prevRead = null,
        prevWritten = null;

    var seq = 
        from c in title
        let norm = RemapInternationalCharToAscii(char.ToLowerInvariant(c).ToString())[0]
        let keep = char.IsLetterOrDigit(norm)
        where prevRead.HasValue || keep
        let replaced = keep ? norm
            :  prevWritten != '-' ? '-'
            :  (char?)null
        where replaced != null
        let s = replaced + (prevRead == null ? ""
            : norm == '#' && "cf".Contains(prevRead.Value) ? "sharp"
            : norm == '+' ? "plus"
            : "")
        let _ = prevRead = norm
        from written in s
        let __ = prevWritten = written
        select written;

    const int maxlen = 80;  
    return string.Concat(seq.Take(maxlen)).TrimEnd('-');
}

public static string RemapInternationalCharToAscii(string text)
{
    var seq = text.Normalize(NormalizationForm.FormD)
        .Where(c => CharUnicodeInfo.GetUnicodeCategory(c) != UnicodeCategory.NonSpacingMark);

    return string.Concat(seq).Normalize(NormalizationForm.FormC);
}

我的测试字符串:

“我喜欢c#， f#， c++，还有……焦糖布丁! !他们看到我在编程……他们hatin”……想抓住我的下流行为……”

重写Jeff的代码，使其更简洁

    public static string RemapInternationalCharToAscii(char c)
    {
        var s = c.ToString().ToLowerInvariant();

        var mappings = new Dictionary<string, string>
        {
            { "a", "àåáâäãåą" },
            { "c", "çćčĉ" },
            { "d", "đ" },
            { "e", "èéêëę" },
            { "g", "ğĝ" },
            { "h", "ĥ" },
            { "i", "ìíîïı" },
            { "j", "ĵ" },
            { "l", "ł" },
            { "n", "ñń" },
            { "o", "òóôõöøőð" },
            { "r", "ř" },
            { "s", "śşšŝ" },
            { "ss", "ß" },
            { "th", "Þ" },
            { "u", "ùúûüŭů" },
            { "y", "ýÿ" },
            { "z", "żźž" }
        };

        foreach(var mapping in mappings)
        {
            if (mapping.Value.Contains(s))
                return mapping.Key;
        }

        return string.Empty;
    }