RE: [xsl] Pattern Matching in XSl - find groups defined in one Xml in another Xml.

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

At 2012-08-29 16:16 +0000, Kerry, Richard wrote:
> Regarding Ken's solutions from last Wednesday (repeated below), why is it :
>
> <xsl:analyze-string select="$thisAlarm/@equipment" 
> regex="^{$thisGroupedAlarm/@equipment}$">
> <xsl:matching-substring>
> <xsl:for-each select="regex-group(1)[normalize-space(.)]">
> <xsl:attribute name="found-key" select="."/>
> </xsl:for-each>
> </xsl:matching-substring>
> </xsl:analyze-string>
>
> rather than
>
> <xsl:analyze-string select="$thisAlarm/@equipment" 
> regex="^{$thisGroupedAlarm/@equipment}$">
> <xsl:matching-substring>
> <xsl:attribute name="found-key" select="regex-group(1)"/>
> </xsl:matching-substring>
> </xsl:analyze-string>
>
> ?
>
> What does the [normalize-space(.)] predicate do for us ?

I am positioning the context to be the regex-group(1) string only if 
that string is non-empty (or, at least, not made entirely of 
white-space characters; if you want found white-space preserved, then 
replace normalize-space(.) with string(.) instead).  If the string is 
empty, then I don't want to create the attribute.  If the string is 
non empty, then I want to create the attribute with that string 
value, which is now the context.

In your example, matching "1 Alarm" that does not have any groups 
will create the empty attribute found-key="" ... which wasn't in your 
example of what you wanted.  I understood you to want found-key= 
suppressed if there were no search strings in the content.

So your suggested code will create the empty found-key="" and mine will not.

I hope this is helpful.

. . . . . . . . . . Ken


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