正则表达式匹配 #

给你一个字符串  s  和一个字符规律  p，请你来实现一个支持 '.'  和  '\*'  的正则表达式匹配。 '.' 匹配任意单个字符 '\*' 匹配零个或多个前面的那一个元素 所谓匹配，是要涵盖   整个   字符串  s 的，而不是部分字符串。 说明: s  可能为空，且只包含从  a-z  的小写字母。 p  可能为空，且只包含从  a-z  的小写字母，以及字符  .  和  \*。 示例 1: ``` 输入: s = "aa" p = "a" 输出: false 解释: "a" 无法匹配 "aa" 整个字符串。 ``` 示例 2: ``` 输入: s = "aa" p = "a*" 输出: true 解释: 因为 '*' 代表可以匹配零个或多个前面的那一个元素, 在这里前面的元素就是 'a'。因此，字符串 "aa" 可被视为 'a' 重复了一次。 ``` 示例  3: ``` 输入: s = "ab" p = ".*" 输出: true 解释: ".*" 表示可匹配零个或多个（'*'）任意字符（'.'）。 ``` 示例 4: ``` 输入: s = "aab" p = "c*a*b" 输出: true 解释: 因为 '*' 表示零个或多个，这里 'c' 为 0 个, 'a' 被重复一次。因此可以匹配字符串 "aab"。 ``` 示例 5: ``` 输入: s = "mississippi" p = "mis*is*p*." 输出: false ```

Given an input string (s) and a pattern (p), implement regular expression matching with support for '.' and '\*'. '.' Matches any single character. '\*' Matches zero or more of the preceding element. The matching should cover the entire input string (not partial). Note: s could be empty and contains only lowercase letters a-z. p could be empty and contains only lowercase letters a-z, and characters like . or \*. Example 1: ``` Input: s = "aa" p = "a" Output: false Explanation: "a" does not match the entire string "aa". ``` Example 2: ``` 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". ``` Example 3: ``` Input: s = "ab" p = ".*" Output: true Explanation: ".*" means "zero or more (*) of any character (.)". ``` Example 4: ``` Input: s = "aab" p = "c*a*b" Output: true Explanation: c can be repeated 0 times, a can be repeated 1 time. Therefore, it matches "aab". ``` Example 5: ``` Input: s = "mississippi" p = "mis*is*p*." Output: false ```

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