< cpp | regex
- Regex Lua Tester
- Regexptester 1 17 Download Free
- Php Regex Online Tester
- Regex Tester 1 17 Download Free
Language | ||||
Standard Library Headers | ||||
Freestanding and hosted implementations | ||||
Named requirements | ||||
Language support library | ||||
Concepts library(C++20) | ||||
Diagnostics library | ||||
Utilities library | ||||
Strings library | ||||
Containers library | ||||
Iterators library | ||||
Ranges library(C++20) | ||||
Algorithms library | ||||
Numerics library | ||||
Localizations library | ||||
Input/output library | ||||
Filesystem library(C++17) | ||||
Regular expressions library(C++11) | ||||
Atomic operations library(C++11) | ||||
Thread support library(C++11) | ||||
Technical Specifications |
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Regular expressions libraryClasses | ||||
(C++11) | ||||
(C++11) | ||||
(C++11) | ||||
Algorithms | ||||
(C++11) | ||||
(C++11) | ||||
(C++11) | ||||
Iterators | ||||
(C++11) | ||||
(C++11) | ||||
Exceptions | ||||
(C++11) | ||||
Traits | ||||
(C++11) | ||||
Constants | ||||
(C++11) | ||||
(C++11) | ||||
(C++11) | ||||
Regex Grammar | ||||
(C++11) |
template<class BidirIt, class Alloc, class CharT, class Traits > std::regex_constants::match_default);bool regex_search( BidirIt first, BidirIt last, std::match_results<BidirIt,Alloc>& m, conststd::basic_regex<CharT,Traits>& e, std::regex_constants::match_flag_type flags = | (1) | (since C++11) |
template<class CharT, class Alloc, class Traits > bool regex_search(const CharT* str, std::regex_constants::match_default);std::match_results<const CharT*,Alloc>& m, conststd::basic_regex<CharT,Traits>& e, std::regex_constants::match_flag_type flags = | (2) | (since C++11) |
template<class STraits, class SAlloc, class Alloc, class CharT, class Traits > std::regex_constants::match_default);bool regex_search(conststd::basic_string<CharT,STraits,SAlloc>& s, std::match_results< typenamestd::basic_string<CharT,STraits,SAlloc>::const_iterator, Alloc >& m, conststd::basic_regex<CharT, Traits>& e, std::regex_constants::match_flag_type flags = | (3) | (since C++11) |
template<class BidirIt, class CharT, class Traits > std::regex_constants::match_default);bool regex_search( BidirIt first, BidirIt last, conststd::basic_regex<CharT,Traits>& e, std::regex_constants::match_flag_type flags = | (4) | (since C++11) |
template<class CharT, class Traits > bool regex_search(const CharT* str, std::regex_constants::match_default);conststd::basic_regex<CharT,Traits>& e, std::regex_constants::match_flag_type flags = | (5) | (since C++11) |
template<class STraits, class SAlloc, class CharT, class Traits > std::regex_constants::match_default);bool regex_search(conststd::basic_string<CharT,STraits,SAlloc>& s, conststd::basic_regex<CharT,Traits>& e, std::regex_constants::match_flag_type flags = | (6) | (since C++11) |
template<class STraits, class SAlloc, Appdelete 4 1 4. class Alloc, class CharT, class Traits > std::regex_constants::match_default)= delete;bool regex_search(conststd::basic_string<CharT,STraits,SAlloc>&&, std::match_results< typenamestd::basic_string<CharT,STraits,SAlloc>::const_iterator, Alloc >&, conststd::basic_regex<CharT, Traits>&, std::regex_constants::match_flag_type flags = | (7) | (since C++11) |
Determines if there is a match between the regular expression
e
and some subsequence in the target character sequence.1) Analyzes generic range
[first,last)
. Match results are returned in m
.2) Analyzes a null-terminated string pointed to by
str
. Match results are returned in m
.3) Analyzes a string
s
. Match results are returned in m
.4-6) Equivalent to (1-3), just omits the match results.
7) The overload (3) is prohibited from accepting temporary strings, otherwise this function populates
match_results
m
with string iterators that become invalid immediately.Etrecheck 4 1 – for troubleshooting your machine.
regex_search
will successfully match any subsequence of the given sequence, whereas std::regex_match will only return true if the regular expression matches the entire sequence.[edit]Parameters
first, last | - | a range identifying the target character sequence |
str | - | a pointer to a null-terminated target character sequence |
s | - | a string identifying target character sequence |
e | - | the std::regex that should be applied to the target character sequence |
m | - | the match results |
flags | - | std::regex_constants::match_flag_type governing search behavior |
Type requirements | ||
-BidirIt must meet the requirements of LegacyBidirectionalIterator. | ||
-Alloc must meet the requirements of Allocator. |
[edit]Return value
Returns true if a match exists, false otherwise. In either case, the object
m
is updated, as follows:If the match does not exist:
m.ready()true | |
m.empty()true | |
m.size()0 |
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If the match exists:
m.ready() | true |
m.empty() | false |
m.size() | number of marked subexpressions plus 1, that is, 1+e.mark_count() |
m.prefix().first | first |
m.prefix().second | m[0].first |
m.prefix().matched | m.prefix().first!= m.prefix().second |
m.suffix().first | m[0].second |
m.suffix().second | last |
m.suffix().matched | m.suffix().first!= m.suffix().second |
m[0].first | the start of the matching sequence |
m[0].second | the end of the matching sequence |
m[0].matched | true |
m[n].first | the start of the sequence that matched marked sub-expression n, or last if the subexpression did not participate in the match |
m[n].second | the end of the sequence that matched marked sub-expression n, or last if the subexpression did not participate in the match |
m[n].matched | true if sub-expression n participated in the match, false otherwise |
[edit]Notes
Regex Lua Tester
In order to examine all matches within the target sequence,
std::regex_search
may be called in a loop, restarting each time from m[0].second
of the previous call. std::regex_iterator offers an easy interface to this iteration.[edit]Example
Output:
[edit]Defect reports
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The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
DR | Applied to | Behavior as published | Correct behavior |
---|---|---|---|
LWG 2329 | C++11 | basic_string rvalues were accepted, which was likely to result in dangling iterators | rejected via a deleted overload |
[edit]See also
Php Regex Online Tester
(C++11) | regular expression object (class template)[edit] |
(C++11) | identifies one regular expression match, including all sub-expression matches (class template)[edit] |
(C++11) | attempts to match a regular expression to an entire character sequence (function template)[edit] |
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