Issue 2503: multiline option should be added to syntax_option_type

Title: multiline option should be added to syntax_option_type
Status: c++17
Section: [re.synopt]
Submitter: Nozomu Katō

Created on 2015-05-22.00:00:00 last changed 100 months ago

Messages

Date: 2016-08-02.17:19:11

Proposed resolution:

This wording is relative to N4431.

Change [re.synopt] as indicated:

namespace std::regex_constants {
  typedef T1 syntax_option_type;
  constexpr syntax_option_type icase = unspecified ;
  constexpr syntax_option_type nosubs = unspecified ;
  constexpr syntax_option_type optimize = unspecified ;
  constexpr syntax_option_type collate = unspecified ;
  constexpr syntax_option_type ECMAScript = unspecified ;
  constexpr syntax_option_type basic = unspecified ;
  constexpr syntax_option_type extended = unspecified ;
  constexpr syntax_option_type awk = unspecified ;
  constexpr syntax_option_type grep = unspecified ;
  constexpr syntax_option_type egrep = unspecified ;
  constexpr syntax_option_type multiline = unspecified ;
}

Change [re.matchflag], Table 138 — "syntax_option_type effects" as indicated:

Table 138 — syntax_option_type effects
Element Effect(s) if set

…

multiline Specifies that ^ shall match the beginning of a line and $ shall match the end of a line, if the ECMAScript engine is selected.

…

Table 138 — `syntax_option_type` effects
Element	Effect(s) if set
`…`
`multiline`	Specifies that `^` shall match the beginning of a line and `$` shall match the end of a line, if the ECMAScript engine is selected.
`…`

msg7554 (view)

Date: 2016-08-02.17:19:11

[ 2016-08, Chicago ]

Monday PM: Moved to Tentatively Ready. This also resolves 2343

msg7422 (view)

Date: 2017-02-02.00:41:18

[ Telecon 2015-07 ]

Set the priority to match LWG 2343.

msg7421 (view)

Date: 2015-05-15.00:00:00

[ 2015-05-22, Daniel comments ]

This issue interacts somewhat with LWG 2343.

msg7420 (view)

Date: 2015-05-22.00:00:00

The specification of ECMAScript defines the Multiline property for its RegExp and the regular expressions ^ and $ behave differently according to the value of this property. Thus, this property should be available also in the ECMAScript compatible engine in std::regex.

History
Date	User	Action	Args
2017-07-30 20:15:43	admin	set	status: wp -> c++17
2016-11-14 03:59:28	admin	set	status: pending -> wp
2016-11-14 03:55:22	admin	set	status: ready -> pending
2016-08-02 17:19:11	admin	set	messages: + msg8330
2016-08-02 17:19:11	admin	set	status: new -> ready
2015-09-27 20:55:06	admin	set	messages: + msg7554
2015-05-22 17:34:24	admin	set	messages: + msg7422
2015-05-22 17:34:24	admin	set	messages: + msg7421
2015-05-22 00:00:00	admin	create