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Type syntax_option_type

boost::xpressive::regex_constants::syntax_option_type —

Synopsis

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.

Copyright 2003, 2004 Eric Niebler

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