Basic question: What wildcard characters can be used in find & replace, and what do the characters represent?
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 Apologies for the newbie question: What are the various wildcard characters that can be used in find & replace, and what do they represent? For example, if I want to replace a comma with a space in all instances where the comma is in between 2 numbers, how do I do that? Thank you for your time and guidance! 
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 Hi, 
 there are none :)If you want to perform this kind of replacement, you will need to learn regular expressions (a.k.a. regexp). There are dozens of tutorial on the net, e.g. here: 
 http://www.regular-expressions.info/I should warn you though, that regexp are like women: powerful, mysterious and unforgiving :) 
 And they usually don’t behave the way you expect.
 But don’t be discouraged. It is a great tool, if used properly. In my work, where I deal a lot with a plaintext processing, I would be lost without themAnyway, answer to your particular question about space between two numbers is 
 with regexp search mode:
 Replace
 (\d),(\d)
 with
 \1 \2
