ExplicitPatternGroup LookBehind Equivalent?

This was requested by another customer as well for the VB language. Right now there's no really good way to handle that since there is no look-behind. We do want to implement look-behind soon. However even if we have it, we need a way to assign a common look-behind to a lexical pattern group, like a group of keywords. Do you think we should also add a LookBehind attribute similar to our LookAhead attribute in the lexical pattern group itself that would apply to all inner keywords?

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<font size="1" face="Verdana, Arial">quote:</font><HR>Do you think we should also add a LookBehind attribute similar to our LookAhead attribute in the lexical pattern group itself that would apply to all inner keywords?<HR>

That is exactly how I was thinking it could be handled. Obviously, this is something that should work for both explicit and regex pattern groups. But in my example, adding LookBehind=[^\.] should prevent the keyword from being recogized if it was preceded by a period.

I've been feeling the pain of this as well, and I think you have the right idea. Adding a complement to the "LookAhead" attribute for Explicit and RegEx groups should do the trick.

I have the same issue, and I sorta solved it by defining a token that consists of whitespace followed by the text to distinguish it. That solution is not very robust and messes up the visuals on collapse and so forth.

-- David

That won't work, though, for a large group of explicit patterns, but I agree it would work for regex patterns.