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Showing content from https://cplusplus.github.io/LWG/issue716 below:

Production in [re.grammar] not actually modified

This page is a snapshot from the LWG issues list, see the Library Active Issues List for more information and the meaning of C++11 status.

Section: 28.6.12 [re.grammar] Status: C++11 Submitter: Stephan T. Lavavej Opened: 2007-08-31 Last modified: 2016-01-28

Priority: Not Prioritized

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Discussion:

[tr.re.grammar]/3 and C++0x WP 28.6.12 [re.grammar]/3 say:

The following productions within the ECMAScript grammar are modified as follows:

CharacterClass ::
[ [lookahead ∉ {^}] ClassRanges ]
[ ^ ClassRanges ]

This definition for CharacterClass appears to be exactly identical to that in ECMA-262.

Was an actual modification intended here and accidentally omitted, or was this production accidentally included?

[ Batavia (2009-05): ]

We agree that what is specified is identical to what ECMA-262 specifies. Pete would like to take a bit of time to assess whether we had intended, but failed, to make a change. It would also be useful to hear from John Maddock on the issue.

Move to Open.

[ 2009-07 Frankfurt: ]

Move to Ready.

Proposed resolution:

Remove this mention of the CharacterClass production.

CharacterClass ::
[ [lookahead ∉ {^}] ClassRanges ]
[ ^ ClassRanges ]

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