Apache’s mod_rewrite considered as one of the difficult module to configure and use. This article will lead you through rewrite rules, regular expressions, and rewrite conditions, and provide a great list of examples:

Apache’s low-cost, powerful set of features make it the server of choice for organizations around the world. One of its most valuable treasures is the mod_rewrite module, the purpose of which is to rewrite a visitor’s request URI in the manner specified by a set of rules.

=> Learn Apache mod_rewrite: 13 Real-world Examples