Given an input string
s and a pattern
p, implement regular expression matching with support for
'.'Matches any single character.
'*'Matches zero or more of the preceding element.
The matching should cover the entire input string (not partial).
Input: s = "aa", p = "a" Output: false Explanation: "a" does not match the entire string "aa".
Input: s = "aa", p = "a*" Output: true Explanation: '*' means zero or more of the preceding element, 'a'. Therefore, by repeating 'a' once, it becomes "aa".
Input: s = "ab", p = ".*" Output: true Explanation: ".*" means "zero or more (*) of any character (.)".
1 <= s.length <= 20
1 <= p.length <= 20
scontains only lowercase English letters.
pcontains only lowercase English letters,
'*', there will be a previous valid character to match.