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.
Example
Run this code
#include <stdio.h> #include <string.h> int main(void) { const char* string = "abcde312$#@"; const char* low_alpha = "qwertyuiopasdfghjklzxcvbnm"; size_t spnsz = strspn(string, low_alpha); printf("After skipping initial lowercase letters from '%s'\n" "The remainder is '%s'\n", string, string + spnsz); }
Output:
After skipping initial lowercase letters from 'abcde312$#@' The remainder is '312$#@'
References
- C23 standard (ISO/IEC 9899:2024):
- 7.24.5.6 The strspn function (p: TBD)
- C17 standard (ISO/IEC 9899:2018):
- 7.24.5.6 The strspn function (p: TBD)
- C11 standard (ISO/IEC 9899:2011):
- 7.24.5.6 The strspn function (p: 369)
- C99 standard (ISO/IEC 9899:1999):
- 7.21.5.6 The strspn function (p: 332)
- C89/C90 standard (ISO/IEC 9899:1990):
- 4.11.5.6 The strspn function
See also
| returns the length of the maximum initial segment that consists of only the characters not found in another byte string (function) | |
| (C95) |
returns the length of the maximum initial segment that consists of only the wide characters found in another wide string (function) |
| finds the first location of any character in one string, in another string (function) | |
| C++ documentation for strspn
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