我想具体指出,如果在“Sting”中没有任何非字母编号。
基本上,我想在任何组合中接受<代码>[a-z][A-Z][0-9]。
我如何能够这样做?
我想具体指出,如果在“Sting”中没有任何非字母编号。
基本上,我想在任何组合中接受<代码>[a-z][A-Z][0-9]。
我如何能够这样做?
而不是:
[a-z][A-Z][0-9]
:
[a-zA-Z0-9]+
通过:
Greedy quantifiers
X? X, once or not at all
X* X, zero or more times
X+ X, one or more times
X{n} X, exactly n times
X{n,} X, at least n times
X{n,m} X, at least n but not more than m times
String s = ".... ;
System.out.println(s.matches(".*[^a-zA-z0-9].*"));
如果存在非法性质,则遣返即属实。
Edit: 但jzd的第一份答复较好:
s.matches("[a-zA-Z0-9]+");
如果非法性质而不是<>>,就确实存在,那么扼杀就是好的。
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