strcspn
From cppreference.com
| Defined in header <string.h>
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| size_t strcspn( const char *dest, const char *src ); |
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Returns the length of the maximum initial segment of the null-terminated byte string pointed to by dest, that consists of only the characters not 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.
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