TYPE SYNTAX_OPTIO(3)

NAME
boost::xpressive::regex_constants::syntax_option_type

SYNOPSIS

// In header: <boost/xpressive/regex_constants.hpp>
enum syntax_option_type { ECMAScript =  0, icase =  1 << 1, nosubs =  1 << 2,
                          optimize =  1 << 3, collate =  1 << 4,
                          single_line =  1 << 10, not_dot_null =  1 << 11,
                          not_dot_newline =  1 << 12,
                          ignore_white_space =  1 << 13 };

DESCRIPTION

Flags used to customize the regex syntax

ECMAScript
    Specifies that the grammar recognized by the regular expression engine uses its normal semantics: that is the same as that given in the ECMA-262, ECMAScript Language Specification, Chapter 15 part 10, RegExp (Regular Expression) Objects (FWD.1).

icase
    Specifies that matching of regular expressions against a character container sequence shall be performed without regard to case.

nosubs
    Specifies that when a regular expression is matched against a character container sequence, then no sub-expression matches are to be stored in the supplied match_results structure.

optimize
    Specifies that the regular expression engine should pay more attention to the speed with which regular expressions are matched, and less to the speed with which regular expression objects are constructed. Otherwise it has no detectable effect on the program output.

collate
    Specifies that character ranges of the form "[a-b]" should be locale sensitive.

single_line
    Specifies that the ^ and $ metacharacters DO NOT match at internal line breaks. Note that this is the opposite of the perl default. It is the inverse of perl's /m (multi-line) modifier.

not_dot_null
    Specifies that the . metacharacter does not match the null character \0.

not_dot_newline
    Specifies that the . metacharacter does not match the newline character \n.

ignore_white_space
    Specifies that non-escaped white-space is not significant.