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It is a modifier, meaning "zero or more of the previous thing". ? means "zero or one of the previous thing", and + means "one or more ..." etc.

It ends the sentence in my previous post. It's...

grep does not use wildcard, it uses regular expressions. So, "a*" means match "", or "a", or "aaaaaaa", or "aaaaaaaaaaaaaaaaaa", etc.

Try "ora.*r2". . has a special meaning to regular...