Boost C++ Libraries

Type syntax_option_type is an implementation specific bitmask type that controls how a regular expression string is to be interpreted. For convenience note that all the constants listed here, are also duplicated within the scope of class template basic_regex.

namespace std{ namespace regex_constants{

typedef implementation-specific-bitmask-type syntax_option_type;

// these flags are standardized:
static const syntax_option_type normal;
static const syntax_option_type ECMAScript = normal;
static const syntax_option_type JavaScript = normal;
static const syntax_option_type JScript = normal;
static const syntax_option_type perl = normal;
static const syntax_option_type basic;
static const syntax_option_type sed = basic;
static const syntax_option_type extended;
static const syntax_option_type awk;
static const syntax_option_type grep;
static const syntax_option_type egrep;
static const syntax_option_type icase;
static const syntax_option_type nosubs;
static const syntax_option_type optimize;
static const syntax_option_type collate;
// other Boost.Regex specific options are listed below

} // namespace regex_constants
} // namespace std