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I used to have a rewrite rule to

RewriteRule ^([^/]+)\.htm$ index.php?c=$1 [NC]
RewriteRule ^([^/]+)\.htm/([0-9.]+)$ index.php?c=$1&amt=$2 [NC]

Now, I have to change to

RewriteRule ^1/([^/]+)\.htm$ index.php?c=$1 [NC]
RewriteRule ^1/([^/]+)\.htm/([0-9.]+)$ index.php?c=$1&amt=$2 [NC]
RewriteRule ^2/([^/]+)\.htm$ index2.php?c=$1 [NC]
RewriteRule ^2/([^/]+)\.htm/([0-9.]+)$ index2.php?c=$1&amt=$2 [NC]

The difference is adding a sub-directory.

My question is, how can I redirect my old links to the new 1/ sub-directory?

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You mean index.php is located in the /1 subdirectory? –  Jason McCreary May 21 '11 at 13:53
    
index.php is in the root directory, but i have two now(index.php, index2.php), and need to redirect the old ones to sub-directory 1/. index.php can be any other name, right? –  user761396 May 21 '11 at 13:58
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2 Answers 2

Itai's answer is going in the right direction, but I don't think it's quite there yet. This is how I would do it:

RewriteRule ^([^/]+\.htm(/[0-9.]+)?)$ 1/$1 [NC,NS,L,R=301]

This will match those (and only those) URLs matched by your original two RewriteRules, and will prefix 1/ to them using an HTTP 301 redirect.

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If you want to redirect traffic from search engines, you should use 301 Redirect using something like:

RewriteRule ^([^12][^/]+)\.htm$ 1/index.php?c=$1 [R=301,L]

This will not work if some of your old files start by 1 or 2. If so, you can probably omit the [^12] and place this rule last. You will have to tag the old rules with last as well, replacing the [NC] by [NC,L].

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This looks right except I think it would be more appropriate to redirect to 1/$1.htm –  matthew Jul 21 '11 at 4:04
    
Actually, you can just omit the [^12], period. The regexp ^([^/]+)\.htm$ cannot match anything beginning with 1/ or 2/, since those prefixes contain a slash. –  Ilmari Karonen Mar 17 '12 at 18:58
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