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Regular expressions (Regexp)is one of the advanced concept we require to write efficient shell scripts and for effective system administration. Basically regular expressions are divided in to 3 types for better understanding. 1)Basic Regular expressions 2)Interval Regular expressions (Use option -E for grep and -r for sed) 3)Extended Regular expressions (Use option -E for grep and -r for sed) Some FAQ's before starting Regular expressions What is a Regular expression? A regular expression is a concept of matching a pattern in a given string. Which commands/programming languages support regular expressions? vi, tr, rename, grep, sed, awk, perl, python etc. Basic Regular Expressions...