Regular expression and URL Rewriting

Question

I have a URL http://abc.com/v2/ and now i want that if anyone put the URL something like this http://abc.com/v2/abc or http://abc.com/v2/xyz should be redirected to http://abc.com/

in general i want that anything put after /v2/ must be redirected to http://abc.com/

Please also tell me how to learn more about URL rewriting (for Apache environment) and Regular expression

Answer 1

Also that's a pretty basic rule then:

 RewriteRule  ^v2/  http://abc.com/   [R]

The [R] flag is for redirection, but in this case implied anyway. And the ^ start of subject marker would simply replace the leading / in your example.

As resources: http://regular-expressions.info/ for a regex tutorial, and ServerFault: Everything You Ever Wanted to Know about Mod_Rewrite Rules but Were Afraid to Ask? for the RewriteRules, as well as the current manual: http://httpd.apache.org/docs/current/mod/mod_rewrite.html

Answer 2

The first link in Google for "apache url rewriting":

http://httpd.apache.org/docs/2.0/misc/rewriteguide.html

I used mod_rewrite myself, it isn't hard. Please put forth a bit more effort before asking other people to Google things for you.

Answer 3

Here's the good RewriteRule you may apply:

RewriteRule  ^v2/(.*)  /$1   [QSA,R=301]

As for your other question, I do agree with Eric Johnson but here are my 2c:

• Here's the wiki of serverfault.com
• The howto's htaccess official guide
• The official mod_rewrite guide

Two hints to help you doing the job faster:

---

Please try to use the RewriteLog directive: it helps you to track down problems:

# Trace:
# (!) file gets big quickly, remove in prod environments:
RewriteLog "/web/logs/mywebsite.rewrite.log"
RewriteLogLevel 9
RewriteEngine On

---

My favorite tool to check for regexp:

http://www.quanetic.com/Regex (don't forget to choose ereg(POSIX) instead of preg(PCRE)!)

You use this tool when you want to check the URL and see if they're valid or not.

Answer 4

You can put on start page. Or create auto include file with this code:

$value = "http://".$_SERVER['SERVER_NAME'].$_SERVER['REQUEST_URI'];
$pattern = "http://abc.com/v2/";
$rez = str_replace($pattern,"",$value);

if(strlen($rez)>0){
    echo "Here";
    header("Location: http://abc.com");
}