leetcode - Regular Expression Matching

'.'

'*'

'.' 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) {
for(char c = *p; c != 0; ++s, c = *p) {
if(*(p+1) != '*')
p++;
else if(isMatch( s, p+2))
return true;
if((*s==0) || ((c!='.') && (c!=*s)))
return false;
}
return *s == 0;
}
};