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Comments on regular expressions from TAMURA Kent on 2000-04-10 (www-xml-schema-comments@w3.org from April to June 2000)
Comments on regular expressions
- From: TAMURA Kent <kent@trl.ibm.co.jp>
- Date: Mon, 10 Apr 2000 16:06:46 +0900
- To: www-xml-schema-comments@w3.org
- CC: kent@trl.ibm.co.jp
- Message-Id: <200004100706.QAA31636@ns.trl.ibm.com>
I have some comments on the regular expressions section in the last call draft [1]. [1] https://www.w3.org/TR/2000/WD-xmlschema-2-20000407/#regexs Re: The entire It is hard to know concrete syntax of the regular expression from the draft. I want readable rules like BNF. Re: Character class subtraction E.1: > [Definition:] A character class subtraction is a character > class expression subtracted from a positive character group or > negative character group, using the - character. This definition does not explain how to use '-'. The next paragraph says "G-C is a valid character class subtraction", but there are no restriction on other usages of '-', like "GC-", "-GC" :-) Re: '-' in character range A '-' in a character class has many meanings. So, interpretation of '-' can be ambiguous. For example: [+--/] We can interpret this character class as: a) '+' to '-', and '/' b) '+', and '-' to '/' Re: Definition of multi-character escape "\w" is defined as "[�-]-[\p{P}\p{S}\p{C}]", but both of � and  are invalid character references in XML. I don't know characters in 𐀀- should be in "\w". -- TAMURA Kent @ Tokyo Research Laboratory, IBM
Received on Monday, 10 April 2000 03:07:26 UTC