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。

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;
    }

我将代码移植到TypeScript中。它可以很容易地适应JavaScript。

我添加了一个.contains方法到字符串原型，如果你的目标是最新的浏览器或ES6，你可以使用.includes代替。

if (!String.prototype.contains) {
    String.prototype.contains = function (check) {
        return this.indexOf(check, 0) !== -1;
    };
}

declare interface String {
    contains(check: string): boolean;
}

export function MakeUrlFriendly(title: string) {
            if (title == null || title == '')
                return '';

            const maxlen = 80;
            let len = title.length;
            let prevdash = false;
            let result = '';
            let c: string;
            let cc: number;
            let remapInternationalCharToAscii = function (c: string) {
                let s = c.toLowerCase();
                if ("àåáâäãåą".contains(s)) {
                    return "a";
                }
                else if ("èéêëę".contains(s)) {
                    return "e";
                }
                else if ("ìíîïı".contains(s)) {
                    return "i";
                }
                else if ("òóôõöøőð".contains(s)) {
                    return "o";
                }
                else if ("ùúûüŭů".contains(s)) {
                    return "u";
                }
                else if ("çćčĉ".contains(s)) {
                    return "c";
                }
                else if ("żźž".contains(s)) {
                    return "z";
                }
                else if ("śşšŝ".contains(s)) {
                    return "s";
                }
                else if ("ñń".contains(s)) {
                    return "n";
                }
                else if ("ýÿ".contains(s)) {
                    return "y";
                }
                else if ("ğĝ".contains(s)) {
                    return "g";
                }
                else if (c == 'ř') {
                    return "r";
                }
                else if (c == 'ł') {
                    return "l";
                }
                else if (c == 'đ') {
                    return "d";
                }
                else if (c == 'ß') {
                    return "ss";
                }
                else if (c == 'Þ') {
                    return "th";
                }
                else if (c == 'ĥ') {
                    return "h";
                }
                else if (c == 'ĵ') {
                    return "j";
                }
                else {
                    return "";
                }
            };

            for (let i = 0; i < len; i++) {
                c = title[i];
                cc = c.charCodeAt(0);

                if ((cc >= 97 /* a */ && cc <= 122 /* z */) || (cc >= 48 /* 0 */ && cc <= 57 /* 9 */)) {
                    result += c;
                    prevdash = false;
                }
                else if ((cc >= 65 && cc <= 90 /* A - Z */)) {
                    result += c.toLowerCase();
                    prevdash = false;
                }
                else if (c == ' ' || c == ',' || c == '.' || c == '/' || c == '\\' || c == '-' || c == '_' || c == '=') {
                    if (!prevdash && result.length > 0) {
                        result += '-';
                        prevdash = true;
                    }
                }
                else if (cc >= 128) {
                    let prevlen = result.length;
                    result += remapInternationalCharToAscii(c);
                    if (prevlen != result.length) prevdash = false;
                }
                if (i == maxlen) break;
            }

            if (prevdash)
                return result.substring(0, result.length - 1);
            else
                return result;
        }

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"

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'

我不太了解Ruby或Rails，但在Perl中，这是我要做的:

my $title = "How do you change a title to be part of the url like Stackoverflow?";

my $url = lc $title;   # Change to lower case and copy to URL.
$url =~ s/^\s+//g;     # Remove leading spaces.
$url =~ s/\s+$//g;     # Remove trailing spaces.
$url =~ s/\s+/\-/g;    # Change one or more spaces to single hyphen.
$url =~ s/[^\w\-]//g;  # Remove any non-word characters.

print "$title\n$url\n";

我刚做了一个快速测试，似乎有用。希望这在Ruby中比较容易翻译。