std::strspn
From cppreference.com
Defined in header <cstring>
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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 byte string pointed to by dest
, that consists of only the characters found in byte string pointed to by src
.
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 byte string pointed to by src
Example
Run this code
#include <cstring> #include <string> #include <iostream> 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$#@'
See also
returns the length of the maximum initial segment that consists of only the characters not found in another byte string (function) | |
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 from a set of separators (function) | |
C documentation for strspn
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