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;

// 
// The remaining options are specific to Boost.Regex:
//

// Options common to both Perl and POSIX regular expressions:
static const syntax_option_type newline_alt;
static const syntax_option_type no_except;
static const syntax_option_type  save_subexpression_location;

// Perl specific options:
static const syntax_option_type no_mod_m;
static const syntax_option_type no_mod_s;
static const syntax_option_type mod_s;
static const syntax_option_type mod_x;
static const syntax_option_type no_empty_expressions;

// POSIX extended specific options:
static const syntax_option_type no_escape_in_lists;
static const syntax_option_type no_bk_refs;

// POSIX basic specific options:
static const syntax_option_type no_escape_in_lists;
static const syntax_option_type no_char_classes;
static const syntax_option_type no_intervals;
static const syntax_option_type bk_plus_qm;
static const syntax_option_type bk_vbar;

} // namespace regex_constants
} // namespace std