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

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