.htaccess RegEx for variable file version

Question

I would like clients to be able to access certain files using an arbitrary version number to bypass caching.

For example, suppose there are two files: styles.css and jquery.min.js They should be able to request either the originals or styles.23.css and jquery.min.5039.css.

The rule I came up with was:

RewriteEngine On
RewriteRule ^(.*)\.(?!\..*)[\d]+\.(.*)$ $1.$2 # strip out version number
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ index.php [QSA,L]

Broken down, here's my thought on what it should be doing:

^(.*) – starting from the beginning, match all
\. – up to the first period...
(?!\..*) - ...which is not followed by a period and anything,
[\d]+\. – then match if ends in one or more digits followed by a period...
(.*)$ – ...and anything

This RegEx actually works seems to work in PHP but not .htaccess, which has me a bit confused.

Thank you in advance.

anubhava · Accepted Answer · 2013-09-17 07:05:51Z

1

Why do you need lookahead etc. Following should work:

RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.+?)\.\d+\.(.*)$ $1.$2 [L]

answered Sep 17, 2013 at 7:05

anubhava

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Synexis Over a year ago

Hi, thank you. I had completely forgotten about putting an additional "%{REQUEST_FILENAME} !-f" before the rule when testing various patterns, so they all failed at one point or another. I ended up using a variation of yours except instead of (.+?) at the beginning (which removes the first set of digits), I used (.*) which effectively removes the last, so file.12.34.123456.js loads file.12.34.js.

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