[c++] regex_search 함수

1.함수 헤더 파일

#include <regex>

2.함수 원형

template <class BidIt, class Alloc, class Elem, class RXtraits, class Alloc2>
bool regex_search(
    BidIt first,
    Bidit last,
    match_results<BidIt, Alloc>& match,
    const basic_regex<Elem, RXtraits, Alloc2>& re,
    match_flag_type flags = match_default);

template <class BidIt, class Elem, class RXtraits, class Alloc2>
bool regex_search(
    BidIt first,
    Bidit last,
    const basic_regex<Elem, RXtraits, Alloc2>& re,
    match_flag_type flags = match_default);

template <class Elem, class Alloc, class RXtraits, class Alloc2>
bool regex_search(
    const Elem* ptr,
    match_results<const Elem*, Alloc>& match,
    const basic_regex<Elem, RXtraits, Alloc2>& re,
    match_flag_type flags = match_default);

template <class Elem, class RXtraits, class Alloc2>
bool regex_search(
    const Elem* ptr,
    const basic_regex<Elem, RXtraits, Alloc2>& re,
    match_flag_type flags = match_default);

template <class IOtraits, class IOalloc, class Alloc, class Elem, class RXtraits, class Alloc2>
bool regex_search(
    const basic_string<Elem, IOtraits, IOalloc>& str,
    match_results<typename basic_string<Elem, IOtraits, IOalloc>::const_iterator, Alloc>& match,
    const basic_regex<Elem, RXtraits, Alloc2>& re,
    match_flag_type flags = match_default);

template <class IOtraits, class IOalloc, class Elem, class RXtraits, class Alloc2>
bool regex_search(
    const basic_string<Elem, IOtraits, IOalloc>& str,
    const basic_regex<Elem, RXtraits, Alloc2>& re,
    match_flag_type flags = match_default);

 

3. Parameter (매개 변수)

BidIt	The iterator type for submatches.
Alloc	The match result allocator class.
Elem	The type of element to find a match for.
RXtraits	The attribute class for the element.
Alloc2	The regular expression allocator class.
IOtraits	A string attribute class.
IOalloc	String allocator class.
flags	Flags for matching.
first	The start of the matching sequence.
last	End of matching sequence.
match	Match result.
ptr	A pointer to the start of the matching sequence.
re	The regular expression to look for matches.
str	A string to match.

 

 

4. Described

re : 각 템플릿 함수는 피연산자 시퀀스에서 해당 정규식 인수 검색이 성공한 경우에만 true를 반환합니다.

match result : 개체를 가져오는 함수는 검색이 성공했는지 여부를 반영하도록 구성원을 설정하고, 성공한 경우 정규식의 다양한 캡처 그룹을 캡처합니다.

 

 

4.예제

#include <iostream>
#include <regex>

using namespace std;

int main(){
	const char *first = "abcd";
    const char *last = first + strlen(first);
    cmatch mr;
    regex_constants::match_flag_type f1 = regex_constants::match_default;
    regex rx("abc");
    
    cout << "search(f, f+1, \"abc\") == " << boolalpha << regex_search(first, first + 1, rx, f1) <<endl;

    cout << "search(f, l, \"abc\") == " << boolalpha << regex_search(first, last, mr, rx) <<endl;
     cout << "  matched: \"" << mr.str() << "\"" << endl;

    cout << "search(string, \"abc\") == " << boolalpha  << regex_search(string("a"), rx) << endl;

    string str("abcabc");
    match_results<string::const_iterator> mr2;
    cout <<  "search(string, \"abc\") == " << boolalpha << regex_search(str, mr2, rx) << endl;
    cout << " matched \"" << mr2.str() << "\"" << endl;
}

search(f, f+1, "abc") == false
search(f, l, "abc") == true
  matched: "abc"
search(string, "abc") == false
search(string, "abc") == true
 matched "abc"