Following to [IDEA] Extract Feature in The TiddlyWiki Core - Discussion - Talk TW and the suggestion by @TW_Tones I developed a user defined filter operator extract.substring
Code
\procedure filter-pattern() ♭[\w|\s|\W]+?♭
\function search-pattern() =[<start>escaperegexp[]] ="([\w|\s|\W]+?)" =[<stop>escaperegexp[]] :and[join[]]
\function extract.substring(start, stop)
[search-replace:g:regexp<search-pattern>,[♭start♭$1♭stop♭]]
:and[split[♭start]split[stop♭]regexp<filter-pattern>search-replace:g[♭],[]]
\end extract.substring
<!--REMARKS
The unicode symbol used for substring border: ♭
Start and stop delimiter can be the same like @@Jeremy@@
-->
How it works
- The
extract.substringhas two parameters, start delimiter and stop delimiter - The input is a selection of titles
Example
Extract all highlighted text. A highlighted word is the one delimited by two @@.
<$let myinput="@@TiddlyWiki@@ is an amazing piece of @@software@@.">
<$list filter="[<myinput>extract.substring[@@],[@@]]">
<$text text=<<currentTiddler>> /><br/>
</$list>
</$let>
This produces
TiddlyWiki
software
Demo
- Download extract-substring.json (1.7 KB)
- Drag and drop into https://tiddlywiki.com
- Open one of the examples or write your own
Alternative: An improved alternative to this filter operator with detailed documentation can be found here: How to Extract Delimited Substrings from a Longer String - #5 by jacng