Hi Tony, 

I think you know the answer. 

 - [is[current]] internally reads the <<currentTiddler>> variable and 
compares it with the "inputed list" ... If there is no input it uses every 
tiddler.
 - [regexp:keywords[Wiki]] will search all tiddlers from the input list if 
the "search word" is part of the field. 

The regexp search is heavier than searching the list of all tiddlers, 
especially if you search the "text field". 

So if you do a regexp search in 1 tiddler will need less time if you do a 
regexp search in every tiddler and then look if the current tiddler is part 
of the list. 

-------------------

But this:
- [all[current]regexp:keywords[Wiki]]  does the same thing is much faster. 

[all[current]] doesn't search the input list. It internally reads the 
currentTiddler variable and returns it. done. 

[is[current]] can be negated, [all[current]] can't.

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