human
I found an interesting problem on https://leetcode.com/problems/valid-parentheses/:
Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.

An input string is valid if:

       Open brackets must be closed by the same type of brackets.
       Open brackets must be closed in the correct order.

Note that an empty string is also considered valid.

Example 1:

Input: "()"
Output: true

Example 2:

Input: "()[]{}"
Output: true

Example 3:

Input: "(]"
Output: false

Example 4:

Input: "([)]"
Output: false

Example 5:

Input: "{[]}"
Output: true

I tried it in Python, but could not do it. Can you solve it?

 What is a Python program to determine if the input string is valid?
assistant
#Here is Python program to determine if the input string is valid.

class Solution:
     
     import re
     
     def isValid(self, s):
         """
         :type s: str
         :rtype: bool
         """
         
         while(s!=""):
             len_orig = len(s)
             s = s.replace('()', '')
             s = s.replace('[]', '')
             s = s.replace('{}', '')
             if len(s) == len_orig:
                 return False
     
         return True