Comment on the following statement: There is no program in the entire Unix toolbox that can’t be mastered in less time than it takes to learn how to play the piano well. What is a regular expression?...

Comment on the following statement: There is no program in the entire Unix toolbox that can’t be mastered in less time than it takes to learn how to play the piano well.

What is a regular expression? What are two common abbreviations for “regular expression”?