What is RewriteCond and RewriteRule?

htaccess rewrite rule includes setting a combination of rewrite condition ( RewriteCond ) tests along with a corresponding rule ( RewriteRule ) if the prior conditions pass. In most cases, these rules should be placed at any point after the RewriteEngine on line in the . htaccess file located in the website’s docroot.

What is Apache RewriteRule?

The mod_rewrite module uses a rule-based rewriting engine, based on a PCRE regular-expression parser, to rewrite requested URLs on the fly. By default, mod_rewrite maps a URL to a filesystem path. However, it can also be used to redirect one URL to another URL, or to invoke an internal proxy fetch.

What does RewriteCond mean?

RewriteCond means a condition must be true in order for the next RewriteRule to be processed. %{REQUEST_FILENAME} is a variable set by the server to contain the request URL, not just a filename as it may appear. A reference to a valid server file will cause this condition to be false.

How do I turn on rewrite mode?

Open terminal and typin a2enmod rewrite , It will enable your mod_rewrite module for Apache. Then go to /etc/apache2/sites-available and edit default file. (For this you must have writable permissions to this file and sites-available folder.) Take clean URL test again and this time it will be passed.

How do rewrite rules work?

mod_rewrite works through the rules one at a time, processing any rules that match the requested URL. If a rule rewrites the requested URL to a new URL, that new URL is then used from that point onward in the . htaccess file, and might be matched by another RewriteRule further down the file.

What are rewrite rules in linguistics?

a rule of the form A → X where A is a syntactic category label, such as noun phrase or sentence, and X is a sequence of such labels and/or morphemes, expressing the fact that A can be replaced by X in generating the constituent structure of a sentence. Also called: rewrite rule. Compare transformational rule.

What is a .htaccess file?

htaccess files (or “distributed configuration files”) provide a way to make configuration changes on a per-directory basis. A file, containing one or more configuration directives, is placed in a particular document directory, and the directives apply to that directory, and all subdirectories thereof.

How to deal with the query string in rewriterule?

(For examples of how to deal with the query string, see the discussion of the RewriteCond directive.) You must define a RegEx to say “if the URI looks like this, apply the substitution”.

What is the regex argument in rewriterule-httpd?

Let’s go now into the details for each argument. The pattern (rule search-pattern, rule-pattern) is a defined regular expression (RegEx) to match against the URI-path (in per-dir context local filepath) of the current request. That is, everything after _ http://hostname_, and not including any query string arguments.

How to negate the result of a regex?

To negate the result of the RegEx, prefix the RegEx with an exclamation mark. The substitution (sometimes called target) is a string to replace the current filename with it. So it’s the location you want rewrite to. The syntax of the substitution depends upon in which context you’re using the RewriteRule.

When to use mod rewrite before or after a regular expression?

In mod_rewritethe !character can be used before a regular expression to negate it. This is, a string will be considered to have matched only if it does not match the rest of the expression. Regex Back-Reference Availability