strspn
From cppreference.com
| Defined in header <string.h>
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| size_t strspn( const char *dest, const char *src ); |
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Returns the length of the maximum initial segment (span) of the null-terminated byte string pointed to by dest, that consists of only the characters found in the null-terminated byte string pointed to by src.
The behavior is undefined if either dest or src is not a pointer to a null-terminated byte string.
Parameters
| dest | - | pointer to the null-terminated byte string to be analyzed |
| src | - | pointer to the null-terminated byte string that contains the characters to search for |
Return value
The length of the maximum initial segment that contains only characters from the null-terminated byte string pointed to by src