Wildcard Matching

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:
int matchedIdx(const char *s, const char *p)

Some examples:
matchedIdx("aa","a") → 0
matchedIdx("juliadntdas","a*nt") → 4


  1. Similar to LeetCode: 44. Wildcard Matching, Wildcard Pattern Matching @ GeeksforGeeks and String Matching with Wildcards @ Hackerrank problem except here it is required to output the index of the first occurrence.
  2. Code
 bool isMatch(const char *s, const char *p) {
        const char* star=NULL;
        const char* ss=s;
        while (*s){
            //advancing both pointers when (both characters match) or ('?' found in pattern)
            //note that *p will not advance beyond its length 
            if ((*p=='?')||(*p==*s)){s++;p++;continue;} 

            // * found in pattern, track index of *, only advancing pattern pointer 
            if (*p=='*'){star=p++; ss=s;continue;} 

            //current characters didn't match, last pattern pointer was *, current pattern pointer is not *
            //only advancing pattern pointer
            if (star){ p = star+1; s=++ss;continue;} 

           //current pattern pointer is not star, last patter pointer was not *
           //characters do not match
            return false;

       //check for remaining characters in pattern
        while (*p=='*'){p++;}

        return !*p;  

results matching ""

    No results matching ""