RetroSearch Browse

Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://en.cppreference.com/w/cpp/language/../regex/basic_regex.html below:

std::basic_regex - cppreference.com

(since C++11)

The class template basic_regex provides a general framework for holding regular expressions.

Several typedefs for common character types are provided:

Type Definition std::regex std::basic_regex<char> std::wregex std::basic_regex<wchar_t> [edit] Member types [edit] Member functions constructs the regex object
(public member function) [edit] destructs the regex object
(public member function) [edit] assigns the contents
(public member function) [edit] assigns the contents
(public member function) [edit] Observers returns the number of marked sub-expressions within the regular expression
(public member function) [edit] returns the syntax flags
(public member function) [edit] Locale get locale information
(public member function) [edit] set locale information
(public member function) [edit] Modifiers swaps the contents
(public member function) [edit] Constants Grammar option Effect(s) ECMAScript Use the Modified ECMAScript regular expression grammar. basic Use the basic POSIX regular expression grammar (grammar documentation). extended Use the extended POSIX regular expression grammar (grammar documentation). awk Use the regular expression grammar used by the awk utility in POSIX (grammar documentation). grep Use the regular expression grammar used by the grep utility in POSIX. This is effectively the same as the basic option with the addition of newline '\n' as an alternation separator. egrep Use the regular expression grammar used by the grep utility, with the -E option, in POSIX. This is effectively the same as the extended option with the addition of newline '\n' as an alternation separator in addition to '|'. Grammar variation Effect(s) icase Character matching should be performed without regard to case. nosubs When performing matches, all marked sub-expressions (expr) are treated as non-marking sub-expressions (?:expr). No matches are stored in the supplied std::regex_match structure and mark_count() is zero. optimize Instructs the regular expression engine to make matching faster, with the potential cost of making construction slower. For example, this might mean converting a non-deterministic FSA to a deterministic FSA. collate Character ranges of the form "[a-b]" will be locale sensitive. multiline (C++17) Specifies that ^ shall match the beginning of a line and $ shall match the end of a line, if the ECMAScript engine is selected.

At most one grammar option can be chosen out of ECMAScript, basic, extended, awk, grep, egrep. If no grammar is chosen, ECMAScript is assumed to be selected. The other options serve as variations, such that std::regex("meow", std::regex::icase) is equivalent to std::regex("meow", std::regex::ECMAScript|std::regex::icase).

The member constants in basic_regex are duplicates of the syntax_option_type constants defined in the namespace std::regex_constants.

[edit] Non-member functions [edit] Deduction guides(since C++17)

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4