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如何在空白领域进行微小验证?
原标题:How to skip @Pattern validation on a blank field?

我正在利用我共同基金管理的灯塔的JSR303星号验证说明验证案文投入。 注:

@Size(min=0, max=20, message = "Value cannot be more than 20 characters")
@Pattern(regexp = "[^|]", message = "Invalid entry. See field description.")  
private String txt;

<代码>@Pattern 说明中发现管道特性时有错误。 但是,当用户离开现场空白和点击时,错误也被推倒。 为什么出现这种情况?

最佳回答

由于reg/编码需要一种特性才能匹配。 页: 1

以下是一些测试:

System.out.println(Pattern.matches("[^|]", "")); // false
System.out.println(Pattern.matches("[^|]", "a")); // true
System.out.println(Pattern.matches("[^|]", "aaa")); // false
System.out.println(Pattern.matches("[^|]*", "")); // true
System.out.println(Pattern.matches("[^|]*", "aaa")); // true
System.out.println(Pattern.matches("[^|]*", "a|a")); // false
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