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Answer the question about the wildcards below a. Explain how many types of REGEX exist. b. How can we create a command line to display

Answer the question about the wildcards below

a. Explain how many types of REGEX exist.

b. How can we create a command line to display (e.g with cat command) the lines by which the character a precedes character t in a.txt file. What kind of REGEX is that?

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