Help With RewriteRule Regexp

Home » CentOS » Help With RewriteRule Regexp
CentOS 5 Comments

My regexp skills are somewhere infinitesimally close to zero. I have never really ‘gotten’ them.

That said, I have spent a couple hours already search for help to write a rewriterule that works on a string in the URL. In particular I want success if either of the following were provided:

webmail.domain (e.g.
server/webmail (e.g.

And I have not found anything like this, nor do I know even close enough of regexp to recognize something like this in another expression.

Thanks for the help.

5 thoughts on - Help With RewriteRule Regexp

  • Seems I left off one point in this message.

    This is to refine these rules in my Apache server.

    RewriteCond %{SERVER_PORT} !^443$
    RewriteRule ^.*$ https://%{SERVER_NAME}%{REQUEST_URI} [L,R]

    I only want the rewrite if the URL includes webmail as I indicate below.

    I have found that now the RewriteCond is ‘recommended’ to be changed to:

    RewriteCond %{SERVER_PORT} !D3

    But I have not found how to test for a string in the URL in the RewriteRule.

  • And it won’t if ‘http://webmail.domain’ is the actual text, the ^ says “at the start of the line” (in other words, ‘webmail\.’ must start in character position 1). Choices: Remove the caret and accept the consequence that all references to “webmail\.” will be changed or determine how to re-write (pardon the pun) the rule to narrow the scope to (such as) ^http://webmail\. (http:// at the beginning of the line). I’m not familiar with Apache regex implementation so I can’t say that it will accept the construct I supplied, hopefully someone else can speak to that.

    —– Original Message —

  • Hmmm, maybe I spoke too soon, why the second test didn’t match isn’t obvious to me (unless Apache regex is different from grep).

    —– Original Message —