HackerRank Incorrect Regex solution in python

In this incorrect regex problem solution in python, You are given a string S. Your task is to find out whether S is a valid regex or not.

Problem solution in Python 2 programming.

import re

for t in xrange(int(input())):
    S = raw_input()
    try:
        re.compile(S)
        print True
    except:
        print False

Problem solution in Python 3 programming.

# Enter your code here. Read input from STDIN. Print output to STDOUT
import re
for _ in range(int(input())):
    ans = True
    try:
        reg = re.compile(input())
    except re.error:
        ans = False
    print(ans)

Problem solution in pypy programming.

# Enter your code here. Read input from STDIN. Print output to STDOUT
import re
for _ in xrange(input()):  
    try:
        print bool(re.compile(raw_input()))
    except:
        print 'False'

Problem solution in pypy3 programming.

import re
T = int(input())
for _ in range(T):
    try:
        re.compile(input())
        print(True)
    except Exception:
        print(False)