Simple explanation of Regex?

Is there a simple explanation of how to create Regex find and replace patterns?
I need to convert Czech dates like 31. října 1967 to 31 October 1967 and that kind of thing. I know it should be easy, and I have just about figure out how to actually find expressions, but not how to replace them. I would love to find some kind of resource that would teach Regex to a complete newbie with zero knowlege of programming rather than having to ask people to come up with solutions for me.

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