std::strspn
From cppreference.com
C++
Feature test macros (C++20)
Concepts library (C++20)
Metaprogramming library (C++11)
Ranges library (C++20)
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Text processing library
Regular expressions library (C++11)
Formatting library (C++20)
(C++17)
(C++17)
(C++17)
(C++17)
(C++17)
(C++26)
Defined in header
<cstring>
size_t strspn( const char* dest, const char* src );
Returns the length of the maximum initial segment (span) of the byte string pointed to by dest, that consists of only the characters found in byte string pointed to by src.
Contents
[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 <cstring> #include <iostream> #include <string> const char* low_alpha = "qwertyuiopasdfghjklzxcvbnm"; int main() { std::string s = "abcde312$#@"; std::size_t spnsz = std::strspn(s.c_str(), low_alpha); std::cout << "After skipping initial lowercase letters from '" << s << "'\nThe remainder is '" << s.substr(spnsz) << "'\n"; }
Output:
After skipping initial lowercase letters from 'abcde312$#@' The remainder is '312$#@'
[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]
returns the length of the maximum initial segment that consists
of only the wide characters found in another wide string
(function) [edit]
of only the wide characters found in another wide string
(function) [edit]
C documentation for strspn