Implement wildcard pattern matching with support for '?'
and '*'
.
'?' Matches any single character. '*' Matches any sequence of characters (including the empty sequence). 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", "*") → true isMatch("aa", "a*") → true isMatch("ab", "?*") → true isMatch("aab", "c*a*b") → false
思考:又一道正则表达式匹配。参考[这里]。
class Solution { public: bool isMatch(const char *s, const char *p) { bool star = false; const char* starPtr = NULL; const char* savePtr = NULL; while(*s != ' ') { if(*p == '?') s++, p++; else if(*p == '*') { while(*p == '*') p++; p--; starPtr = p; p++; savePtr = s; star = true; } else { if(*s == *p) s++, p++; else { if(star == true) s = ++savePtr, p = starPtr+1;//depend on star else return false; } } } while(*p == '*') p++; return (*s == ' ' && *p == ' '); } };