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I really had big troubles understanding all the preg_ functions in pset 6, 7 and 8, especially its cryptic first argument which is called a regular expression and looks like this: /^\d+$/

preg_match("/^\d+$/", $_POST["shares"])
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I hope I can save someone some headache:

Eventually this website helped me understand regular expressions and that they are a very powerful tool every programmer should know:

Read here only the first paragraph: http://www.regular-expressions.info/index.html then head directly to the Quick Start Section: http://www.regular-expressions.info/quickstart.html

It's worth to spend some minutes there. CS50 Staff should have add this links into the problem sets recommended reading list!

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