010_Regular_Expression_Matching.py

class Solution:
    def isMatch(self, s: str, p: str) -> bool:
        matched = [[False for _ in range(len(p) + 1)] for _ in range(len(s) + 1)]
        matched[0][0] = True
        
        for i in range(len(s) + 1):
            for j in range(1, len(p) + 1):
                pattern = p[j - 1]
                
                if pattern == '.':
                    matched[i][j] = (i != 0 and matched[i - 1][j - 1])
                elif pattern == '*':
                    star = p[j - 2]
                    matched[i][j] = matched[i][j - 2] or (i > 0 and matched[i - 1][j] and 
                                                          (star == s[i - 1] or star == '.'))
                else:
                    matched[i][j] = (i != 0 and matched[i - 1][j - 1] and s[i - 1] == pattern)
        return matched[-1][-1]