Thank you.

I=92ll check it out.

Can you share your experience with the performance of the two/three =
regular expression engines that you listed (JDK1.4, JDK1.5 and .NET) on =
the same set of regular expression given a similar data-set for =
matching/non-matching text?

 

Thanks.

 

Shlomo

 

________________________________

From: Michael Kay [mailto:mike@s...] 
Sent: =E0 23 =F1=F4=E8=EE=E1=F8 2007 20:56
To: Shlomo Yona; xmlschema-dev@w...
Subject: RE: pattern facet implementations

 

Saxon has an internal API that you could use to test patterns against =
strings without creating complete schemas and instance documents.

 

Essentially:

 

import net.sf.saxon.java.JRegularExpression;

 

JRegularExpression regex = new JRegularExpression("[A-Z]", false, 0);

if (regex.matches("A")) ...

 

Internally Saxon is translating the schema-syntax regex into either JDK =
1.4 or JDK 1.5 regex syntax, and then using the JDK regex engine =
underneath. The translators are derived from code written and published =
by James Clark, fairly substantially modified. The 1.4 and 1.5 versions =
differ because JDK 1.5 changed "." to match a surrogate pair rather than =
matching each half of a surrogate pair.

 

This should work in Saxon-B, there's no need to install the schema-aware =
product. (That's because the same code is also used to support XPath 2.0 =
regular expression handling).

 

It's probably also possible, but not quite so easy, to access the =
corresponding methods on Saxon's .NET product, which use the Microsoft =
.NET regular expression engine as the target. 

 

It's possible that other schema processors are using the combination of =
James Clark's translation routines with the JDK regex engine; but there =
are still going to be significant differences between the =
implementations.

 

Michael Kay

	 

=09
________________________________


	From: xmlschema-dev-request@w... =
[mailto:xmlschema-dev-request@w...] On Behalf Of Shlomo Yona
	Sent: 23 September 2007 19:15
	To: xmlschema-dev@w...
	Subject: pattern facet implementations

	Hello,

	 

	Are there implementations of xsd:pattern facet available as stand-alone =
or as a modular component that can be integrated into a test environment =
or a schema processor?

	 

	I=92d like to run tests on a pattern facet implementation and cross =
reference the results with other implementations of this schema feature =
for functionality and performance.

	 

	Also, are there XML Schema processors that use the same =93engines=94 =
for patterns? I=92d rather test against different implementations rather =
than the same one.

	 

	Thanks.

	 

	Shlomo.