Setting conditions for rewriting URLs

- [Voiceover] One of the most powerful aspects…of mod_rewrite is the ability to set conditions…for rewriting URLs.…It's also, probably, the most complex.…You define a condition with the RewriteCond directive.…It's case-insensitive, but there must be no space…within the keyword.…It's followed by a space and the incoming value…that you want to match.…This can be literal text,…a server variable,…or a combination of both.…The condition comes after another space.…

We'll look at conditions in a moment.…You can apply mulitple conditions…to the same rewrite rule…by adding subsequent RewriteCond directives…on separate lines.…The conditions only apply to the next rewrite rule.…In this case, both conditions need to be true…for the rule to be applied.…To combine two conditions as alternatives,…add OR in square brackets after the first one.…In this example, the rewrite rule would be applied…if either condition is true.…

Server variables can be used in the incoming value…either on their own or combined with literal text.…They take this format,…