Web Reference: Apr 8, 2025 · String operations are fundamental in C programming, and strspn is a key function for analyzing string content. This tutorial covers strspn in depth, including its syntax, usage, and practical applications. Oct 2, 2017 · 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. Syntax : size_t strspn (const char *str1, const char *str2)str1 : string to be scanned. str2 : string containing the characters to match. The strspn() function in C computes the length of the initial segment of a string that consists entirely of characters from a specified set. It is commonly used for parsing and validating input where only certain characters are allowed at the beginning of a string.
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