Actually, I would like to develop a filter to extract some multi-digit 
number from tiddler titles to be used in list filter magic. Remembering 
Jeremy's motto of better doing it more universal, where appropriate, I'm 
asking here about the design of a "replace" filter: the bad twin of the 
regex filter. I would like to hear feedback on my idea, and the design. 

Would you deem such a filter of broader use?

And how do I overcome the limitation of filters to have only one operand? 
For a replace filter I would need the regex, and also the replacement 
expression. So, two operands. Is there a better way than to simply string 
these two operands together, with some strange delemiter between them, such 
as ::?

Any feedback and help greatly appreciated! 
TheDiveO

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