COMP 141: Lexics and CFGS Instructions: In this exercise, we are going to review regular expressions as a mechanism to specify tokens. 1 Regex 1. Define the regex for the following description of tokens: (a) Any string that starts with character t. 6) Any string of at least length 3 that starts with t and ends with u. (e) Any string that specifies the range of numbers between 11 and 23. (d) Any string that specifies a date in MM:DD:YYYY format 2. In Can identifier is defined as a string of characters (both upper-case and lower-case), digits, and underscore "". starting with either a character or underscore. Define the regex for identifiers in C. 3. Give tive strings that conform with the regex: (0-9)+((Ele) (\+1\-)?[0-9]+)