strspn
From cppreference.com
C
Concurrency support (C11)
Null-terminated byte strings
Functions
Character manipulation
Conversions to and from numeric formats
(C99)(C99)
(C99)(C99)
(C23)(C23)(C23)
String manipulation
String examination
Memory manipulation
Miscellaneous
(C11)(C11)
Defined in header
<string.h>
size_t strspn( const char* dest, const char* src );
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.
[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 the null-terminated byte string pointed to by src.
[edit] 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$#@'
[edit] 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
[edit] See also
returns the length of the maximum initial segment that consists
of only the characters not found in another byte string
(function) [edit]
of only the characters not found in another byte string
(function) [edit]
(C95)
of only the wide characters found in another wide string
(function) [edit]
C++ documentation for strspn