hoaproject/Compiler — pull request #6 by CircleCode (2013-06-25 22:17:56+00:00)
Title: attempt to allow look-behind assertions in tokens

instead of consuming matched text, offset is increased
and regex matching is tested from offset.

Note: since we remove the '^' anchor in the preg_match test
this can lead to degraded performance.

this allows for example following pp :

```
%skip SPACE \s
%token FOO foo(?= bar)
%token BAR bar
%token BAZ (?<=bar )baz

#doc:

```

with following string :

```
foo bar baz
```

----
maybe this can help #5