std::regex_constants::syntax_option_type

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Defined in header <regex.h>

typedef /*unspecified*/ syntax_option_type;

static constexpr icase = /*unspecified*/;
static constexpr nosubs = /*unspecified*/;
static constexpr optimize = /*unspecified*/;
static constexpr collate = /*unspecified*/;
static constexpr ECMAScript = /*unspecified*/;
static constexpr basic = /*unspecified*/;
static constexpr extended = /*unspecified*/;
static constexpr awk = /*unspecified*/;
static constexpr grep = /*unspecified*/;

static constexpr egrep = /*unspecified*/;

The syntax_option_type is a type that contains options that govern how regular expressions behave.

[edit] Constants

Value Effect(s)
icase Character matching should be performed without regard to case.
nosubs When performing matches, no sub-expression matches should be stored in the supplied std::regex_match structure.
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.
ECMAScript Use a modified version of the ECMAScript regular expression grammar (ECMA-262). ECMA-262 is also known as JavaScript and is effectively the same as Perl5.
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.
egrep Use the regular expression grammar used by the grep utility, with the -E option, in POSIX.