Martin Honnen wrote

>That attribute regex allows an attribute value template I think so {} is
>supposed to have an XPath expression inside. You would need to double
>the curly braces or you can define a variable

Doubling up the braces seems to work. I've now got this in the matches
function:
<xsl:template match="TreeName[matches(., '^\s*\{[^\}]+\}\s*$')]">

and this in the analyze-string:
<xsl:analyze-string select="." regex="^\s*\{{([^\}}]+)\}}\s*$">

I found it very confusing that one requires the {} to be doubled and the
other doesn't. Where is it documented which attributes require braces to be
doubled up and which do not?

Many thanks for your help - Rowan

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