我不熟悉Ruby on Rails，但以下是(未经测试的)PHP代码。如果您觉得有用的话，可以很快地将其转换为Ruby on Rails。

$sURL = "This is a title to convert to URL-format. It has 1 number in it!";
// To lower-case
$sURL = strtolower($sURL);

// Replace all non-word characters with spaces
$sURL = preg_replace("/\W+/", " ", $sURL);

// Remove trailing spaces (so we won't end with a separator)
$sURL = trim($sURL);

// Replace spaces with separators (hyphens)
$sURL = str_replace(" ", "-", $sURL);

echo $sURL;
// outputs: this-is-a-title-to-convert-to-url-format-it-has-1-number-in-it

我希望这能有所帮助。

您需要设置一个自定义路由，将URL指向将处理它的控制器。因为您使用的是Ruby on Rails，这里介绍一下如何使用他们的路由引擎。

在Ruby中，你需要一个你已经知道的正则表达式，下面是要使用的正则表达式:

def permalink_for(str)
    str.gsub(/[^\w\/]|[!\(\)\.]+/, ' ').strip.downcase.gsub(/\ +/, '-')
end

如果你正在使用Rails edge，你可以依赖Inflector。参数化-下面是文档中的例子:

  class Person
    def to_param
      "#{id}-#{name.parameterize}"
    end
  end

  @person = Person.find(1)
  # => #<Person id: 1, name: "Donald E. Knuth">

  <%= link_to(@person.name, person_path(@person)) %>
  # => <a href="/person/1-donald-e-knuth">Donald E. Knuth</a>

另外，如果你需要在以前版本的Rails中处理更多的外来字符，比如重音(éphémère)，你可以混合使用PermalinkFu和DiacriticsFu:

DiacriticsFu::escape("éphémère")
=> "ephemere"

DiacriticsFu::escape("räksmörgås")
=> "raksmorgas"

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;
    }

现在所有的浏览器都能很好地处理utf8编码，所以你可以使用WebUtility。UrlEncode方法，它类似于HttpUtility。@giamin使用的UrlEncode，但它在web应用程序之外工作。