[TxMt] Re: grammar feature request: true begin-while

[Allan Odgaard]

On 7 Feb 2014, at 2:08, Matt Neuburg wrote:

> I can't believe this would be expensive

It would add complexity to the parser, its API, and it would affect its 
run-time.

> and it would solve a LOT of Asciidoc grammar problems, where there are 
> many multi-line patterns such as this one.

I have considered allowing \n in regular expressions to match multiple 
lines. I did this for the firstLineMatch pattern (which can match 
multiple leading lines, if \n is part of its regexp).

Though it is no simple change and it would affect the run-time, but 
ideally TM would know when such patterns were involved, and thus the 
penalty would be insignificant for grammars that do not use such 
patterns.

The lack of setext header support is definitely a thorn in my eye.