Subject: RE: Regular expression functions (Was: Re: [xsl] comments on Dece mber F&O draft) From: "Hunsberger, Peter" <Peter.Hunsberger@xxxxxxxxxx> Date: Thu, 10 Jan 2002 10:12:20 -0600 |
> There are a couple of issues that would need to be worked out with it, > though. What happens if you have a regular expression that involved > two instances of the named subexpression at the same level: > > <matcher name="two-numbers" regexp=":fancy-number:\w:fancy-number:"> > ... > </matcher> > > You need to have separate indexes to indicate which one you're talking > about, plus some kind of syntax to pull out submatches within the > named subexpression. Borrowing from XPath syntax (which might be a bad > idea), you might have: > > fancy-number[2]/*[2] > > to indicate the second subexpression of the second fancy-number > subexpression in the matched string. > > Actually, that syntax isn't all that bad - you can imagine the matcher > actually builds up a tree structure based on the subexpression > matches (you need 'anonymous' elements for unnamed subexpressions, but > you should be able to get away with that using elements in some > restricted namespace or something)... If a "matcher" explicitly returns a tree structure you could view it as sending the results to the output document. Thus, wrapping it in a variable would allow you to manipulate the results in a natural (XSL at least) way: <xsl:variable name="gunk"> <xsl:apply-templates select-regexp=":fancy-number:\w:fancy-number:" /> </xsl:variable> <xsl:value-of select="$gunk[2]/*[2]"/> (The template might actually be doing a "match-regexp", but to keep things concise let's pretend the example is complete :-). This seems to minimize the need to invent new stuff? Adding a similar form of regexp qualifier/attribute to copy and copy-of would seem to handle all general cases, no? Peter Hunsberger XSL-List info and archive: http://www.mulberrytech.com/xsl/xsl-list
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