Issue 2330: regex("meow", regex::icase) is technically forbidden but should be permitted

Title: regex("meow", regex::icase) is technically forbidden but should be permitted
Status: c++14
Section: [re.synopt]
Submitter: Stephan T. Lavavej

Created on 2013-09-21.00:00:00 last changed 123 months ago

Messages

msg6843 (view)

Date: 2014-02-13.15:14:54

Proposed resolution:

This wording is relative to N3691.

Edit [re.synopt] as indicated:

-1- The type syntax_option_type is an implementation-defined bitmask type (17.5.2.1.3). Setting its elements has the effects listed in table 138. A valid value of type syntax_option_type shall have ~~exactly~~at most one of the grammar elements ECMAScript, basic, extended, awk, grep, egrep, set. If no grammar element is set, the default grammar is ECMAScript.

msg6728 (view)

Date: 2014-02-13.15:14:54

[ Issaquah 2014-02-11: Move to Immediate ]

msg6727 (view)

Date: 2013-09-21.00:00:00

[re.synopt]/1 says "A valid value of type syntax_option_type shall have exactly one of the elements ECMAScript, basic, extended, awk, grep, egrep, set."

This "exactly one" wording technically forbids passing icase by itself! Users should not be required to pass regex::ECMAScript | regex::icase. (Note that the cost of an additional check for no grammar being explicitly requested is completely irrelevant, as regex construction is so much more expensive.)

History
Date	User	Action	Args
2014-02-27 17:03:20	admin	set	status: wp -> c++14
2014-02-20 13:52:38	admin	set	status: immediate -> wp
2014-02-13 15:14:54	admin	set	messages: + msg6843
2014-02-13 15:14:54	admin	set	status: new -> immediate
2013-10-12 18:59:12	admin	set	messages: + msg6728
2013-09-21 00:00:00	admin	create