ANTLR3：确保该字符至少出现在一个地方
我试图确保带有通配符的文本中至少包含一个字符，
fragment CHARACTER : ('a'..'z'|'0'..'9'|'-'|'&'|'@'|'$'|'%'|'.'|':');
fragment WILDCARD_QUESTION : ('?');
WILD_STRING
: (CHARACTER)*
(
(WILDCARD_QUESTION)
(CHARACTER)*
)+;
即使使用一个？在我希望失败的地方被接受。因此，仅应传递至少一个字符的序列。
我需要的是 a?、?a、?a?、a?a 等通过。只有 ?、?? 等应该失败。即应该至少有一个字符而不仅仅是WILDCARD_QUESTION。该字符可以位于通配符的任一侧。
I am trying to ensure that at least one character is included in the text with wildcards
fragment CHARACTER : ('a'..'z'|'0'..'9'|'-'|'&'|'@'|'
Using this even a single ? gets accepted where as I would like it to fail. So only sequences that that at least one character should be passed.
What I need is for a?, ?a, ?a?, a?a etc to pass. Only ?, ?? etc should fail. ie there should be at least one character and not just WILDCARD_QUESTION. The character can be on either side of the wildcard.
|'%'|'.'|':');
fragment WILDCARD_QUESTION : ('?');
WILD_STRING
: (CHARACTER)*
(
(WILDCARD_QUESTION)
(CHARACTER)*
)+;
Using this even a single ? gets accepted where as I would like it to fail. So only sequences that that at least one character should be passed.
What I need is for a?, ?a, ?a?, a?a etc to pass. Only ?, ?? etc should fail. ie there should be at least one character and not just WILDCARD_QUESTION. The character can be on either side of the wildcard.
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评论（2）
使用两条规则来执行此操作，一条用于前导通配符，另一条用于前导字符：
Do it with two rules, one for leading WILDCARDs and one for leading CHARACTERs:
更改代码以读取
这似乎可以解决问题。
Changed code to read
This seems to solve the issue.