[Haskell-cafe] Alex and Flex
manlio_perillo at libero.it
Fri Oct 3 16:32:23 EDT 2008
Brandon S. Allbery KF8NH ha scritto:
> On Oct 3, 2008, at 09:24 , Manlio Perillo wrote:
>> Manlio Perillo ha scritto:
>>> However I have noted that there are some difference in the syntax
>>> between Alex and Flex?
>>> What is the rationale?
>> By the way, here is the list of differences between Alex and Flex I
>> have found, for people interested:
>> 3) Alex does not support
>> that must be rewritten as
> The only *reliable* way to write that cset is to put the '-' as the
> first item. Likewise for ']' (and if you must match both, "[-]...]").
Escaping the character solve the problem, or at least I have tested and
It seems, however, that Alex is quite strict in accepted characters.
As an example, this rule
does not match the space character; this character must be escaped:
Flex seems to be more "smart", here.
Note that the escaping solve the problem 7):
\-?@nmstart at nmchar*
Thanks Manlio Perillo
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