Difference between revisions of "cpp/regex/regex match"
m (Text replace - "{{cpp|" to "{{c|") |
(added see also, example) |
||
| Line 61: | Line 61: | ||
2) Behaves as (1) above, omitting the match results. | 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). | + | 3) Returns {{c|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). | + | 4) Returns {{c|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). | + | 5) Returns {{c|std::regex_match(str, str + std::char_traits<charT>::length(str), e, flags)}}. |
| − | 6) Returns std::regex_match(s.begin(), s.end(), e, flags). | + | 6) Returns {{c|std::regex_match(s.begin(), s.end(), e, flags)}}. |
===Parameters=== | ===Parameters=== | ||
{{param list begin}} | {{param list begin}} | ||
| − | {{param list item | first, last | the target character range}} | + | {{param list item | first, last | the target character range to apply the regex to, given as iterators}} |
{{param list item | m | the match results}} | {{param list item | m | the match results}} | ||
| − | {{param list item | str | a target | + | {{param list item | str | a target string, given as a null-terminated C-style string}} |
| − | {{param list item | s | a target | + | {{param list item | s | a target string, given as a {{c|std::basic_string}} }} |
{{param list item | e | the std::regex}} | {{param list item | e | the std::regex}} | ||
| − | {{param list item | flags | the match | + | {{param list item | flags | flags used to determine how the match will be performed}} |
{{param list end}} | {{param list end}} | ||
===Return value=== | ===Return value=== | ||
Returns {{c|true}} if a match exists, {{c|false}} otherwise. | Returns {{c|true}} if a match exists, {{c|false}} otherwise. | ||
| + | |||
| + | ===Example=== | ||
| + | {{example | ||
| + | | code= | ||
| + | #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("foo.txt", txt_regex) << '\n'; | ||
| + | } | ||
| + | } | ||
| + | | output= | ||
| + | foo.txt: 1 | ||
| + | bar.txt: 1 | ||
| + | zoidberg: 0 | ||
| + | }} | ||
| + | |||
| + | ===See also=== | ||
| + | {{dcl list begin}} | ||
| + | {{dcl list template | cpp/regex/dcl list basic_regex}} | ||
| + | {{dcl list template | cpp/regex/dcl list match_results}} | ||
| + | {{dcl list end}} | ||
Revision as of 09:21, 8 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("foo.txt", txt_regex) << '\n'; } }
Output:
foo.txt: 1 bar.txt: 1 zoidberg: 0
