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# strspn

From cppreference.com
< c‎ | string‎ | byte

Defined in header `<string.h>` |  |
size_t strspn( const char *dest, const char *src ); |  |

Returns the length of the maximum initial segment of the byte string pointed to by `dest`, that consists of only the characters found in byte string pointed to by `src`.

### [edit] 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

### [edit] Return value

The length of the maximum initial segment that contains only characters from byte string pointed to by `src`

### [edit] Example

Run this code

    #include <string.h>
    #include <stdio.h>

    int main()
    {
        char *string_find = "abcde312$#@";
        char *low_alpha = "qwertyuiopasdfghjklzxcvbnm";
        printf("%i", strspn(string_find, low_alpha));
        return 0;
    }

Output:

    5

### [edit] See also

strcspn | returns the length of the maximum initial segment that consists of only the characters not found in another byte string (function) [edit]
strpbrk | finds the first location of any character in one string, in another string (function) [edit]
C++ documentation for strspn

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