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 [_a-z0-9-] that must be rewritten as [_a-z0-9\-]
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 works. It seems, however, that Alex is quite strict in accepted characters. As an example, this rule [ \t\r\n\f] does not match the space character; this character must be escaped: [\ \t\r\n\f] Flex seems to be more "smart", here. Note that the escaping solve the problem 7): \-?@nmstart@nmchar* Thanks Manlio Perillo