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mod_rewrite Replace Underscores with hyphens in URL

Posted on 2016-09-16
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Last Modified: 2016-11-02
Hello,

I have a RewriteRule that currently modifies a URL to be more SEO friendly

RewriteRule ^(.*)-c-(.*).html$ index.php?cPath=$2&%{QUERY_STRING}

rule above will take this url and modify it

index.php?cPath=277_280

which would result in something like this:

replacement-parts-c-277_280_295.html

I need it to look like this:

replacement-parts-c-277-280-295.html

what Is for the above Rewrite rule to also replace the underscore with a dash.  I have attempted several changes, but I'm failing at regex syntax.  Is there a way to do this within the one rule above?
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Question by:FourMat
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4 Comments
 
LVL 35

Expert Comment

by:Terry Woods
ID: 41802931
Is the existing rule working (except for the underscores for dashes part)?

I'm guessing not, but I wanted to check.
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LVL 42

Accepted Solution

by:
David S. earned 2000 total points
ID: 41803155
You can use the "N" (next) flag to loop and replace characters. (Care must be taken not to create an endless loop!) You can also use the "QSA" (query string append) flag to combine the new query string with any that might already be present. The first rule replaces all underscores except for the last one, which is left for the following non-looping rule to match.
RewriteRule ^(.*-c-[^/_]*?)_([^/_]*?_[^/]*\.html)$ $1-$2 [N]
RewriteRule ^.*-c-([^/_]*?)_([^/_]*)\.html$ index.php?cPath=$1-$2 [QSA]

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Mod_Rewrite Documentation
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Author Comment

by:FourMat
ID: 41817830
David, and Terry, thanks for the responses.  I haven't had a chance to test these ideas (got pulled away on another project briefly)  but will definitely be back on it soon and test, thanks!
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