strspn() function in C
The strspn() function returns the length of the initial substring of the string pointed to by str1 that is made up of only those character contained in the string pointed to by str2.
size_t strspn(const char *str1, const char *str2) str1 : string to be scanned. str2 : string containing the characters to match. Return Value : This function returns the number of characters in the initial segment of str1 which consist only of characters from str2.
Length of initial segment matching 4
Length of initial segment matching 0
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