什么是一个好的完整正则表达式或其他一些过程,将采取标题:

如何将标题更改为URL的一部分,如堆栈溢出?

然后把它变成

how-do-you-change-a-title-to-be-part-of-the-url-like-stack-overflow

在堆栈溢出的seo友好的url中使用?

我使用的开发环境是Ruby on Rails,但是如果有一些其他特定于平台的解决方案(。NET, PHP, Django),我也很想看到这些。

我相信我(或其他读者)在不同的平台上也会遇到同样的问题。

我使用自定义路由,我主要想知道如何改变字符串的所有特殊字符被删除,它都是小写的,所有空白被替换。


当前回答

为了更好地衡量,这里是WordPress中的PHP函数…我认为WordPress是使用花哨链接的最受欢迎的平台之一。

    function sanitize_title_with_dashes($title) {
            $title = strip_tags($title);
            // Preserve escaped octets.
            $title = preg_replace('|%([a-fA-F0-9][a-fA-F0-9])|', '---$1---', $title);
            // Remove percent signs that are not part of an octet.
            $title = str_replace('%', '', $title);
            // Restore octets.
            $title = preg_replace('|---([a-fA-F0-9][a-fA-F0-9])---|', '%$1', $title);
            $title = remove_accents($title);
            if (seems_utf8($title)) {
                    if (function_exists('mb_strtolower')) {
                            $title = mb_strtolower($title, 'UTF-8');
                    }
                    $title = utf8_uri_encode($title, 200);
            }
            $title = strtolower($title);
            $title = preg_replace('/&.+?;/', '', $title); // kill entities
            $title = preg_replace('/[^%a-z0-9 _-]/', '', $title);
            $title = preg_replace('/\s+/', '-', $title);
            $title = preg_replace('|-+|', '-', $title);
            $title = trim($title, '-');
            return $title;
    }

这个函数以及一些支持函数可以在wp-includes/formatting.php中找到。

其他回答

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。

有一个叫PermalinkFu的小Ruby on Rails插件可以做到这一点。escape方法将转换为适合URL的字符串。看一下代码;那个方法很简单。

为了删除非ascii字符,它使用iconv lib将'utf-8'转换为'ascii//ignore//translit'。然后空格变成破折号,所有东西都被缩小,等等。

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……”

您可以使用以下帮助器方法。它可以转换Unicode字符。

public static string ConvertTextToSlug(string s)
{
    StringBuilder sb = new StringBuilder();

    bool wasHyphen = true;

    foreach (char c in s)
    {
        if (char.IsLetterOrDigit(c))
        {
            sb.Append(char.ToLower(c));
            wasHyphen = false;
        }
        else
            if (char.IsWhiteSpace(c) && !wasHyphen)
            {
                sb.Append('-');
                wasHyphen = true;
            }
    }

    // Avoid trailing hyphens
    if (wasHyphen && sb.Length > 0)
        sb.Length--;

    return sb.ToString().Replace("--","-");
}

为了更好地衡量,这里是WordPress中的PHP函数…我认为WordPress是使用花哨链接的最受欢迎的平台之一。

    function sanitize_title_with_dashes($title) {
            $title = strip_tags($title);
            // Preserve escaped octets.
            $title = preg_replace('|%([a-fA-F0-9][a-fA-F0-9])|', '---$1---', $title);
            // Remove percent signs that are not part of an octet.
            $title = str_replace('%', '', $title);
            // Restore octets.
            $title = preg_replace('|---([a-fA-F0-9][a-fA-F0-9])---|', '%$1', $title);
            $title = remove_accents($title);
            if (seems_utf8($title)) {
                    if (function_exists('mb_strtolower')) {
                            $title = mb_strtolower($title, 'UTF-8');
                    }
                    $title = utf8_uri_encode($title, 200);
            }
            $title = strtolower($title);
            $title = preg_replace('/&.+?;/', '', $title); // kill entities
            $title = preg_replace('/[^%a-z0-9 _-]/', '', $title);
            $title = preg_replace('/\s+/', '-', $title);
            $title = preg_replace('|-+|', '-', $title);
            $title = trim($title, '-');
            return $title;
    }

这个函数以及一些支持函数可以在wp-includes/formatting.php中找到。