Regular Expression Examples

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Thank you David, I was having a hard time with regex but this video really made a difference in under 5 minutes.

Kevineatsbabies
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  think you this is really useful,  but on 3:15 min I don't under stand why we can't do like    (a + b )*  aa   (a + b)*     since the question said at leas two aa's   so what is the problem of doing this Please I need help 

sumrjd