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This Apache .htaccess code 301 redirects requests for URLs with underscores (_) to the URL with hyphens.

Please see this article for the working updated code.


SEO benefits of using hyphens/dashes over underscores

According to Matt Cutts the choice is clearly to use dashes or hyphens instead of underscores.

So instead of article_this_is_awesome_page.html you want article-this-is-awesome-page.html.

I often get asked whether I'd recommend dashes or underscores for words in urls. For urls in Google, I would recommend using dashes.


Updated Htaccess

Thanks to lucus for supplying this improved version:

Options +FollowSymLinks
RewriteEngine On
RewriteBase /

RewriteCond %{REQUEST_URI} !\.(html|php)($|?) [NC]
RewriteRule ^([^_]*)_+(.*)$ $1-$2 [E=underscores:Yes,N]

RewriteCond %{ENV:underscores} ^Yes$
RewriteRule (.*) http://%{HTTP_HOST}/$1 [R=301,L]

Example Usage

When http://d.com/the_top_apache_htaccess_article.html is requested by a browser or search engine, a Search-Engine Friendly 301 Redirect is sent telling the client that the correct location for the resource is at http://d.com/the-top-apache-htaccess-article.html

The Apache .htaccess underscore to hyphen conversion code

Options +FollowSymLinks
RewriteEngine On
RewriteBase /

RewriteRule !\.(html|php)$ - [S=6]
RewriteRule ^([^_]*)_([^_]*)_([^_]*)_([^_]*)_([^_]*)_([^_]*)_(.*)$ $1-$2-$3-$4-$5-$6-$7 [E=underscores:Yes]
RewriteRule ^([^_]*)_([^_]*)_([^_]*)_([^_]*)_([^_]*)_(.*)$ $1-$2-$3-$4-$5-$6 [E=underscores:Yes]
RewriteRule ^([^_]*)_([^_]*)_([^_]*)_([^_]*)_(.*)$ $1-$2-$3-$4-$5 [E=underscores:Yes]
RewriteRule ^([^_]*)_([^_]*)_([^_]*)_(.*)$ $1-$2-$3-$4 [E=underscores:Yes]
RewriteRule ^([^_]*)_([^_]*)_(.*)$ $1-$2-$3 [E=underscores:Yes]
RewriteRule ^([^_]*)_(.*)$ $1-$2 [E=underscores:Yes]

RewriteCond %{ENV:underscores} ^Yes$
RewriteRule (.*) /$1 [R=301,L]

Further Reading

  1. The Worlds Greatest Apache .htaccess Guide
  2. Article in htaccessElite forum:Rewrite urls separated by _ underscores to - dashes

Tags

February 22nd, 2007

Comments Welcome

  • Joe

    Hi - Great resource. At the risk of sounding ignorant, could you please tell me where abouts (i.e. in which directory/folder/subdirectory I would place this code to ensure the rewrite to dashes works? Thanks

  • http://neocall-tr.com/ Faruk

    Hello can anyone tell me how can i edit a htaccess multicommand file?i m currently using user friendly code and i added codes for broken links and code for fclearing query_strings
    but at the and it did not work:

    RewriteEngine On
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule . /friendly_url.php

    ErrorDocument 400 http://www.sicaktakip/error_404.html
    ErrorDocument 401 http://www.sicaktakip/error_404.html
    ErrorDocument 403 http://www.sicaktakip/error_404.html
    ErrorDocument 404 http://www.sicaktakip/error_404.html
    ErrorDocument 500/http://www.sicaktakip/index.php
    RewriteCond %{QUERY_STRING} ^source= RewriteRule (.*) /$1? [R=301,L]
    Anyone any idea for that?

  • http://www.aquaculturecouncilwa.com/about_acwa/acwa_committee_of_management mark

    Haven't be able to get this to work, and I've tried all of the variations in the two further reading links.

    I have the file extensions removed on the old site and on the new, so all I really need to do is rewrite the underscores to dashes.

    Love to know where I'm going wrong but not being a tech, I don't really know where toe start.

    PS At the moment I'm testing on a local wamp setup before I go messing around with a live environment.

  • lucas

    it would be better to have html and php extensions skipped using a condition yet still allow querystrings. but more importantly to use one rule to replace underscores and loop it with the N flag instead of trying to anticipate how many there'll be. this version addresses those issues and trims consecutive underscores to a single hyphen.

    Options +FollowSymLinks
    RewriteEngine On
    RewriteBase /

    RewriteCond %{REQUEST_URI} !.(html|php)($|?) [NC]
    RewriteRule ^([^_]*)_+(.*)$ $1-$2 [E=underscores:Yes,N]
    RewriteCond %{ENV:underscores} ^Yes$
    RewriteRule (.*) http://%{HTTP_HOST}/$1 [R=301,L]

  • stefan

    Hello i just wondering if there is anyway to rewrite underscores to slashes.

    Thanks in advance, sorry for my bad english.

  • Jake

    how can you use this rewrite but exclude directories

  • http://crnano.org Chris Phoenix

    The article's example code has S=5 option (skip next five rules) followed by six underscore-elimination rules.

  • Andriy

    And what's your suggestion if the URL can include up to 16 underscores that should be rewritten to hyphens?

  • saurabh

    How i redirect url to error page when we find & or = in url
    Please give me the solution

  • Daniel Harris

    I get a server error 500 when I try this code.

  • prabhu

    how to remove file extension here?

  • noel

    what about if you are using https does that matter when rewriting.
    Options +FollowSymLinks
    RewriteEngine On
    RewriteBase /

    RewriteCond %{REQUEST_URI} !.(html|php)($|?) [NC]
    RewriteRule ^([^_]*)_+(.*)$ $1-$2 [E=underscores:Yes,N]

    RewriteCond %{ENV:underscores} ^Yes$
    RewriteRule (.*) http://%{HTTP_HOST}/$1 [R=301,L]

    These following code in your htaccess?


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