tango -D2 regex

[John Colvin]

On Monday, 16 December 2013 at 07:46:30 UTC, seany wrote:
> I dont find any info on backtrack on tango-D2 regex.
>
> For example, I want to match things like
>
> barFOObar
>
> or
>
> bazFOObaz
>
> so I would use, in PCRE, ^(\w*)FOO($1)$, with $1 meaning the 
> word (given by \w*  that was matced in the first subpattern 
> (\w*)
>
> How to do the samein Tango for D2 (or even phobos for D2)?

FYI if you know your regex at compile-time, the ctRegex in phobos 
is *very* fast.