You're trying to "glue" the result of a transclusion into a string.
Whenever you need to do that, you almost always need a macro. This worked
in my quick test:
\define filt() ^$(dt)$10
<$set name="dt" value={{!!title}}>
Number of entries: <$count filter="[regexp:startdate<filt>]"/>
</$set>
HTH
-- Mark
On Saturday, August 18, 2018 at 6:40:12 AM UTC-7, Pin Tail wrote:
>
> I'm trying to transclude the title of a tiddler into a regular expression
> and can't figure out why it's not working.
>
> I've created a year summary template tiddler, and in a given year, I want
> to show for each month how many tiddlers have a date (in their startdate
> date field) in that month. The idea is that the yeartemplate tiddler would
> be transcluded into a tiddler whose title is simply the year. I want to use
> a regular expression which combines the title of the transcluding tiddler
> (i.e. the year) with each month, in order to show a month-by-month
> breakdown.
>
> So my 2014 tiddler just looks like this:
> {{||yeartemplate}}
>
> And the yeartemplate tiddler, looks like this (focusing just on the month
> of October here, for brevity).
>
> <$set name="filt" value="^{{!!title}}10">
> Number of entries: <$count filter="[regexp:startdate<filt>]"/>
> </$set>
>
> However, this doesn't work. I get a count of zero even though I know there
> are many matching tiddlers. To try and work out what the problem is, I've
> extended my yeartemplate tiddler to compare the transclusion method with
> writing out the regexp directly:
>
> <$set name="filt" value="^201410">
> <<filt>>
>
> Number of entries: <$count filter="[regexp:startdate<filt>]"/>
> </$set>
>
> <$set name="filt" value="^{{!!title}}10">
> <<filt>>
>
> Number of entries: <$count filter="[regexp:startdate<filt>]"/>
> </$set>
>
> The results of the above template, when transcluded into a tiddler with
> the title "2014" are given below:
>
> ^201410 Number of entries: 23
>
> ^201410 Number of entries: 0
>
>
> Even though the "filt" variable which contains the regular expression is
> identical after transclusion, it doesn't find the matching tiddlers which
> *are* found when an identical regexp is hard coded. What's going on?
>
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