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Re: [xsl] Analyze-string Regex to Match Content within Curly Braces

2020-11-17 07:43:48
Curly braces are special in AVTs and they are special in regexes.

To cope with the specialness in AVTs, double them,

To cope with the specialness in regexes, backslash-escape them.

So regex = "\{{[a-z]+\}}"

should do the trick; or as Martin suggests, remove the AVT problem by using a 
variable (making sure you have expand-text="no")

Michael Kay
Saxonica

On 17 Nov 2020, at 12:43, Don Smith dsmith_lockesmith(_at_)yahoo(_dot_)com 
<xsl-list-service(_at_)lists(_dot_)mulberrytech(_dot_)com> wrote:

Once again I find myself at a loss when trying to write a regex in 
analyze-string that matches on an open/close curly brace combination. I'm 
using XSLT 2.0 and Saxon PE-9.6.0.7.

Here's an example of the text content:

<text>In the be{opthyphen}gin{opthyphen}ning</text>

I need to match all occurrences (none nested) of an open and close curly 
brace with the text that occurs in-between.

I started with this successful regex in a non-XSLT context:

{[a-z]+}

Then because the analyze-string @regex is an AVT I double the curly braces:

{{[a-z]+}}

thus:

<xsl:analyze-string select="$content" regex="{{[a-z]+}}" >

That produces the compile error "Syntax error at char 0 in regular 
expression. No expression before quantifier". I've tried everything I can 
think of in terms of using escapes, etc. I've also tried defining the regex 
as a variable and then referencing it from @regex. But I'm just missing 
something in the regex itself (I think). All help is appreciated.

Don
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