leetcode[10]Regular Expression Matching
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). The function prototype should be: bool isMatch(const char *s, const char *p) Some examples: isMatch("aa","a") → false isMatch("aa","aa") → true isMatch("aaa","aa") → false isMatch("aa", "a*") → true isMatch("aa", ".*") → true isMatch("ab", ".*") → true isMatch("aab", "c*a*b") → true
class Solution { public: bool isMatch(const char *s, const char *p) { if (*p=='\0') return *s=='\0'; if (*(p+1)=='*') { while((*s!='\0')&&((*s==*p)||(*p=='.'))) { if (isMatch(s,p+2)) { return true; } else { s++; } } return isMatch(s,p+2); } else { if((*s!='\0')&&((*s==*p)||(*p=='.'))) { return isMatch(s+1,p+1); } return false; } } };