RE: [xsl] Unicode character blocks in strings

["G. Ken Holman" <gkholman@xxxxxxxxxxxxxxxxxxxx>]

At 2009-05-29 12:46 +0100, tom tom wrote:
> I don't understand why the regex \p{{IsCJKUnifiedIdeographs}} 
> contains a double '{}' structure. Why doesn't \p{IsCJKUnifiedIdeographs} work?

Because the value of the regex= attribute is an attribute value template.

In an attribute value template, the single brace is a signal to 
perform a "value-of" instruction with the contents as the value of 
the select= expression.

Since you need actual brace brackets in the attribute, you need to 
double them up in order to escape the attribute value template parsing.

This happens a lot when writing XSLT stylesheets that create Ant 
scripts (a very useful design pattern).

I hope this helps.

. . . . . . . . . . . . Ken

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