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原标题:Java simple regular expression
  • 时间:2011-02-18 13:58:43
  •  标签:
  • java
  • regex

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?

最佳回答

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
问题回答
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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