[DFDL-WG] DFDL Regular Expression proposal

[Mike Beckerle]

Suggest add to "lengthPattern" that the longest possible match is taken.
This is the usual behavior for regular expressions, but it's a clarification
I've seen other places.

 

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From: dfdl-wg-bounces at ogf.org [mailto:dfdl-wg-bounces at ogf.org] On Behalf Of
Alan Powell
Sent: Thursday, April 03, 2008 12:44 PM
To: dfdl-wg at ogf.org
Subject: [DFDL-WG] DFDL Regular Expression proposal

 


Attached is the proposal for the regular expression syntax used to determine
element length. 

Highlights 

*	Based on the XML Schema regular expression subset used by WebSphere
Message Broker. 
*	Only applies to representation = text 
*	Uses LengthPattern property rather than decorated syntax to
distinguish from literals and regular expressions as it is only used in one
place, this avoids everywhere else having to escape the decoration character
and we are running out of decoration characters. 
*	Assumes the pattern is converted to the data code page before
matching against the data stream.




 Comments and improvements as soon as possible please. 


Alan Powell

MP 211, IBM UK Labs, Hursley,  Winchester, SO21 2JN, England
Notes Id: Alan Powell/UK/IBM     email: alan_powell at uk.ibm.com  
Tel: +44 (0)1962 815073                  Fax: +44 (0)1962 816898




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