[ragel-users] Scanner question

Adrian Thurston thurston at complang.org
Sat Dec 6 02:07:16 UTC 2008

Try this:

'num' ( 'b' ('e' 'r'?)? )?

A long time ago there was talk of adding a machine construction function 
(called prefix I think) for this case but it never got done because it 
depended on adding some new syntax forms and I didn't have the time. 
Hopefully I can revive that soon. I defended my PhD yesterday and life 
should return to normal soon :)


Jose Quinteiro wrote:
> That also accepts "nume", "numr", etc., and I want those to be an error.
> Thanks,
> Jose.
> Diego E. "Flameeyes" Pettenò wrote:
>> On Sat, Dec 6, 2008 at 1:42 AM, Jose Quinteiro <jose at ordinate.com> wrote:
>>> I'm trying to write a scanner that accepts "num", "numb", "numbe", etc.
>>> as the same token.  The only way I can think of that accomplishes this is:
>> I admit I haven't even tested, but I'd expect something like 'num'
>> 'b'?'e'?'r'? to work
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