我工作的一个网站，它的CMS用于保存使用下划线作为一个单词分隔符新页面的URL。

I'm working on a site, and its CMS used to save new page urls using the underscore character as a word seperator.

尽管谷歌目前对待强调作为一个字分隔符，这将是苛刻的场地使用破折号，而不是搜索引擎优化的力量。

Despite the fact that Google now treats underscore as a word seperator, the SEO powers that be are demanding the site use dashes instead.

这是非常简单的CMS内的事，当然我可以改变保存在服务于CMS的MySQL数据库的所有现有的网址。

This is very easy to do within the CMS, and I can of course change all existing URLs saved in the MySQL database that serves the CMS.

我的问题就出在编写将301旧式下划线分开联系的新的风格复姓verstion htaccess的规则。

My problem lies in writing a .htaccess rule that will 301 old style underscore seperated links to the new style hyphenated verstion.

我使用的答案这在其他网站上堆栈溢出的问题成功，使用：

I had success using the answers to this Stack Overflow question on other sites, using:

RewriteRule ^([^_]*)_([^_]*_.*) $1-$2 [N]
RewriteRule ^([^_]*)_([^_]*)$ /$1-$2 [L,R=301]

不过此CMS网站使用了大量的现有规则，生产清洁的网址，我不能得到这个工作，与现有的规则集结合使用。

However this CMS site uses a lot of existing rules to produce clean URLs, and I can't get this working in conjunction with the existing rule set.

的.htaccess目前看起来是这样的：

.htaccess currently looks like this:

Options FollowSymLinks
# RewriteOptions MaxRedirects=50

RewriteEngine On
RewriteBase /

RewriteCond %{HTTP_HOST} !^www.mydomain.co.uk$ [NC]
RewriteRule (.*) http://www.mydomain.co.uk/$1 [R=301,L]

#trailing slash enforcement
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_URI} !#
RewriteCond %{REQUEST_URI} !(.*)/$
RewriteRule ^(.*)$ http://www.mydomain.co.uk/$1/ [L,R=301]

RewriteRule ^test/([0-9]+)(/)?$ test_htaccess.php?year=$1 [nc]

RewriteRule ^index(/)?$ index.php

RewriteRule ^department/([^/]*)/([^/]*)/([^/]*)(/)?$ ecom/index.php?action=ecom.details&mode=$1&$2=$3 [nc]
RewriteRule ^department/([^/]*)(/)?$                 ecom/index.php?action=ecom.details&mode=$1 [nc]

RewriteRule ^product/([^/]*)/([^/]*)/([^/]*)(/)?$ ecom/index.php?action=ecom.pdetails&mode=$1&$2=$3 [nc]
RewriteRule ^product/([^/]*)(/)?$                 ecom/index.php?action=ecom.pdetails&mode=$1 [nc]
RewriteRule ^content/([^/]*)(/)?$                 ecom/index.php?action=ecom.cdetails&mode=$1 [nc]

RewriteRule ([^/]*)/action/([^/]*)/([^/]*)/([^/]*)/([^/]*)(/)?$ $1/index.php?action=$2&mode=$3&$4=$5 [nc]
RewriteRule ([^/]*)/action/([^/]*)/([^/]*)(/)?$                 $1/index.php?action=$2&mode=$3 [nc]
RewriteRule ([^/]*)/action/([^/]*)(/)?$                         $1/index.php?action=$2 [nc]
RewriteRule ^eaction/([^/]*)/([^/]*)/([^/]*)/([^/]*)(/)?$       ecom/index.php?action=$1&mode=$2&$3=$4 [nc]
RewriteRule ^eaction/([^/]*)/([^/]*)(/)?$                       ecom/index.php?action=$1&mode=$2 [nc]
RewriteRule ^action/([^/]*)/([^/]*)(/)?$                        index.php?action=$1&mode=$2 [nc]
RewriteRule ^sid/([^/]*)(/)?$                                   index.php?sid=$1 [nc]




## Error Handling ##
#RewriteRule ^error/([^/]*)(/)?$ index.php?action=error&mode=$1 [nc]

# ----------------------------------- Content Section ------------------------------ #
#RewriteRule ^([^/]*)(/)?$ index.php?action=cms&mode=$1 [nc]

RewriteRule ^accessibility(/)?$ index.php?action=cms&mode=accessibility
RewriteRule ^terms(/)?$         index.php?action=cms&mode=conditions
RewriteRule ^privacy(/)?$       index.php?action=cms&mode=privacy
RewriteRule ^memberpoints(/)?$  index.php?action=cms&mode=member_points

RewriteRule ^contactus(/)?$ index.php?action=contactus
RewriteRule ^sitemap(/)?$   index.php?action=sitemap

ErrorDocument 404 /index.php?action=error&mode=content

ExpiresDefault "access plus 3 days"

所有的网页网址均在3以下格式之一：

All page URLS are in one of the 3 following formats:

http://www.mydomain.com/department/some_page_address/

http://www.mydomain.com/product/some_page_address/

http://www.mydomain.com/content/some_page_address/

我敢肯定，我失去了一些东西很明显，但在这个级别我的正则表达式和mod_rewrite的技能显然是没有达到标准。

I'm sure I am missing something obvious, but at this level my regex and mod_rewrite skills clearly aren't up to par.

任何想法将大大AP preciated！

Any ideas would be greatly appreciated!

推荐答案

只要看看你已经使用规则：

Just take the rule you were using already:

RewriteRule ^([^_]*)_([^_]*_.*) $1-$2 [N]
RewriteRule ^([^_]*)_([^_]*)$ /$1-$2 [L,R=301]

......并把它的在的所有其他重写规则，一切都应该工作。

…and put it before all other rewrite rules, and everything should work.

此外，您使用的RewriteBase / 的两倍。你可以忽略它的第二次，因为它已经定义。

Also, you used RewriteBase / twice. You can omit it the second time, since it’s already defined.