1 Regex 1. Define the regex for the following description of tokens: (a) Any string that starts with character t. (b) Any string of at least length 3 that starts with t and ends with u. (c) 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 C, an 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 five strings that conform with the regex: [0-9]+((Ele) (\+1\-) ?[0-9]+)