Regular Expression 1. Chose match(es) for each given basic/extended regular expression (maybe multiple correct matches) and describe the pattern of matched

5) a(a|b)*a (a)ababa (b) aaba (c) aabab (d) aabbaa (e)aa

6) [a-z](\+[a-z0-9])+ (a) x+9 (b) x+y (c) 1 (d) y (e) x++y

7) a (bc)*z (a)azbc (b) az (c) azbcbc (d) acc (e)acz

8) a.*[0-9] (a)a|1 (b) a*2 (c) ab2 (d) abc (e)aaa

9) [a-t]+[\.\?!+] (a)bash! (b) c (c) Java? (d) python! (e)c++

10) [a-z]+[\.\?!]\s*[A-Z] (hint: \s matches any whitespace characters) (a)o. year (b) x?y (c) U.S. (d)Hello!HELLO (e)index?a

11) (very\s)?(cool\s)+(good|bad) weather (a)very weather (b) very cool weather (c) good weather (d) very cool good weather (e)cool bad weather

12) -?([0-9]|([1-9][0-9])) (a)123 (b) -123 (c) -0 (d) -2.2 (e) 1.2

13) -?[0-9]*\.?[0-9]* (a)123 (b) -123 (c) -0 (d) -2.2 (e) 1.2 2.

Write down the extended regular expression for following-

2) An account name which is 8 to 15 characters long, begins with a letter or underscore, ends with a digit, and composed by letters, numbers, underscores and hyphens. (e.g. my_Name1, cat_2, One-1)

3) A single-line comment starting with a # and continuing until the end of the line. Note: only whitespace is allowed between the start of the line and the comment. (e.g. #This program outputs the string hello world.

4) Integers in the range between 00 and 99. (e.g. 0, 00, 01, 15, 55, 59,99)

5) Phone number in any of the following format: 999-(999)9999, 999999-9999, 999-999-9999. (Note: all of these formats should be matched by a single regular expression)

( can you give me a good explanation of how to do those.(not just the ans).)