Difference between revisions of "cpp/regex/regex match"
(added see also, example) |
(the first parameter of regex_match was wrong) |
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std::regex txt_regex("[a-z]+\\.txt"); | std::regex txt_regex("[a-z]+\\.txt"); | ||
for (const auto &fname : fnames) { | for (const auto &fname : fnames) { | ||
| − | std::cout << fname << ": " << std::regex_match( | + | std::cout << fname << ": " << std::regex_match(fname, txt_regex) << '\n'; |
} | } | ||
} | } | ||
Revision as of 02:54, 14 May 2012
Template:cpp/regex/sidebar Template:ddcl list begin <tr class="t-dsc-header">
<td><regex>
<td></td> <td></td> </tr> <tr class="t-dcl ">
<td > class Alloc, class CharT, class Traits >
bool regex_match( BidirectionalIterator first, BidirectionalIterator last,
std::match_results<BidirectionalIterator,Alloc>& m,
const std::basic_regex<CharT,Traits>& e,
std::regex_constants::match_flag_type flags =
<td > (1) </td> <td > (since C++11) </td> </tr> <tr class="t-dcl ">
<td > class CharT, class Traits >
bool regex_match( BidirectionalIterator first, BidirectionalIterator last,
const std::basic_regex<CharT,Traits>& e,
std::regex_constants::match_flag_type flags =
<td > (2) </td> <td > (since C++11) </td> </tr> <tr class="t-dcl ">
<td >bool regex_match( const CharT* str,
std::match<const CharT*,Alloc>& m,
const std::basic_regex<CharT,Traits>& e,
std::regex_constants::match_flag_type flags =
<td > (3) </td> <td > (since C++11) </td> </tr> <tr class="t-dcl ">
<td > class Alloc, class CharT, class Traits >
bool regex_match( const std::basic_string<CharT,STraits,SAlloc>& s,
std::match_results<
typename std::basic_string<CharT,STraits,SAlloc>::const_iterator,
Alloc
>& m,
const std::basic_regex<CharT,Traits>& e,
std::regex_constants::match_flag_type flags =
<td > (4) </td> <td > (since C++11) </td> </tr> <tr class="t-dcl ">
<td >bool regex_match( const CharT* str,
const std::basic_regex<CharT,Traits>& e,
std::regex_constants::match_flag_type flags =
<td > (5) </td> <td > (since C++11) </td> </tr> <tr class="t-dcl ">
<td > class CharT, class Traits >
bool regex_match( const std::basic_string<CharT, STraits, SAlloc>& s,
const std::basic_regex<CharT,Traits>& e,
std::regex_constants::match_flag_type flags =
<td > (6) </td> <td > (since C++11) </td> </tr> Template:ddcl list end
1) Determines if there is a match between the regular express e and the target character sequence [first,last). Match results are returned in m.
2) Behaves as (1) above, omitting the match results.
3) Returns std::regex_match(str, str + std::char_traits<charT>::length(str), m, e, flags).
4) Returns std::regex_match(s.begin(), s.end(), m, e, flags).
5) Returns std::regex_match(str, str + std::char_traits<charT>::length(str), e, flags).
6) Returns std::regex_match(s.begin(), s.end(), e, flags).
Contents |
Parameters
| first, last | - | the target character range to apply the regex to, given as iterators |
| m | - | the match results |
| str | - | a target string, given as a null-terminated C-style string |
| s | - | a target string, given as a std::basic_string |
| e | - | the std::regex |
| flags | - | flags used to determine how the match will be performed |
Return value
Returns true if a match exists, false otherwise.
Example
#include <iostream> #include <string> #include <regex> int main() { std::string fnames[] = {"foo.txt", "bar.txt", "zoidberg"}; std::regex txt_regex("[a-z]+\\.txt"); for (const auto &fname : fnames) { std::cout << fname << ": " << std::regex_match(fname, txt_regex) << '\n'; } }
Output:
foo.txt: 1 bar.txt: 1 zoidberg: 0
