Reguläre Ausdrücke sind Fluch und Segen und man lernt nie aus.

> Regular Expressions are the Swiss Army knife for searching through information for certain patterns. They have a wide arsenal of tools, some of which often go undiscovered or underutilized. Today I will show you some advanced tips for working with regular expressions.

-   [Advanced Regular Expression Tips and Techniques](http://net.tutsplus.com/tutorials/php/advanced-regular-expression-tips-and-techniques/)

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