Re: [xsl] Regex in @select Escaping Puzzle

["Martin Honnen martin.honnen@xxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>]

Am 16.08.2020 um 17:42 schrieb Eliot Kimber ekimber@xxxxxxxxxxxx:
> I have this element as my context element:
>
> <p>{{image_100}}GEO_AS_MC_M01_T02_05.eps{{/image}}</p>
>
> And I want to get the "GEO_AS_MC_M01_T02_05.eps" using analyze-string, where
the value "image_100" could have any value where "100" is in this example.
> I can't work out the way to escape the curly braces in the @regex value so
my match works (or I can't work out what else I might be doing wrong).
> Oxygen's regex search gives me the correct result with this:
>
> \{\{image_.+}}([^{]+)\{\{/image}}
>
> But this attempt in XSLT 3 does not work:
>
> <xsl:analyze-string select="."
regex="\{{\{{image_.+}}(.+)\{{\{{/image}}}}">
> In that the non-matching substring is the entire selected string,
> o;?
> What regex or escaping detail am I missing?

Part of the problem I think is that the "regexp" attribute of
"xsl:analyze-string" allows attribute value templates so you either have
to double curly braces or better declare your pattern as a parameter or
variable before the element e.g. using Michael's suggestion

  <xsl:param name="pattern"
as="xs:string">\{\{image_[^}]+\}\}([^{]+)\{\{/image\}\}</xsl:param>


and then you can use

      <xsl:analyze-string select="." regex="{$pattern}">