Select text from a line in a text file wiki

[Melvin]

I have a tiddler called alphabet with the following content 

a

ab

abc

a b c

abcd

I want to create a filter expression that selects abc and abcd. So the result would be:

abc

abcd

I thought I would need to write something along the lines of:

[regexp:text[abc]]

or

[title[alphabet][text[abc]]

but at best variations on these types of method only give me the title as the result, which is:

alphabet

So what filter expression would I need to make that shows the text content itself of the specific tiddler called alphabet?

Note: I want to do it this way. I do not want to use key-value pairs from a data Tiddler. 

[Aidan Grey]

[Prefix[abc]]

On Thu, Sep 12, 2019, 3:33 PM Melvin, <melvi...@gmail.com> wrote:

I have a tiddler called alphabet with the following content 

a

ab

abc

abcd

I want to create a filter expression that selects abc and abcd. So the result would be:

abc

abcd

I thought I would need to write something along the lines of:

[regexp:text[abc]]

or

[title[alphabet][text[abc]]

but at best variations on these types of method only give me the title as the result, which is:

alphabet

So what filter expression would I need to make that shows the text content itself of the specific tiddler called alphabet?

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[Aidan Grey]

Erk...hit send on accident. Re-read and discovered i addressed wrong issue but them my pinky...

Filter="[Search[abc]]"

The tiddlywiki article on the search operator has more details

[Mark S.]

<$list filter="[title[alphabet]get[text]splitregexp[\n]prefix[abc]]">

</$list>

The gap between <$list> and </$list> is important.

[Melvin]

I see that this works in 5.20 (all kinds of handy iterative string functions have been added in 5.20) but since I'm using noteself, I'm on 5.17

Would you have any idea on how to do it in 5.17? I could try to figure out how to upgrade, but that'll be a difficult task.

Thanks though! I learned a lot through that single expression so I might be able to find another filter operator or multiple operators to help me out. :)

Edit: it's probably not possible before 5.18, since then it *might* be possible to hack around it with subfilter.

Filter expressions really have grown in the last few editions!

[Melvin]

Ah, I solved it.

I tried to create a filter in TW 5.17, but it didn't work. The best things I got were things like:

[title[alphabet]each:list-item[text]]

But the problem is the set behavior. It can't parse on newlines.

At one point it simply occured to me that, while I don't know how to upgrade Noteself to TW 5.21, I did notice that all the string filter manipulations were contained within a single JS macro file. 

So I went to the TW website, found the right shadow tiddler, exported it and imported it into my Noteself version. And now I have the added filter functionality for strings.

I guess this is a prime example of partially upgrading TW in such a way that you get the needed functionality that one wants.