Java - 前向斜线逃脱字符 [英] Java - Forward Slash Escape Character

问题描述

有人可以告诉我如何在Java中使用正斜杠转义字符。我知道反斜杠是\ \，但我试过\ /和/ /没有运气！

Can anybody tell me how I use a forward slash escape character in Java. I know backward slash is \ \ but I've tried \ / and / / with no luck!

这是我的代码： -

Here is my code:-

public boolean checkDate(String dateToCheck) {  
    if(dateToCheck.matches("[0-9][0-9]\ /[0-9][0-9]\ /[0-9][0-9][0-9][0-9]")) {
        return true;
    } // end if.
    return false;
} // end method.

提前感谢！

推荐答案

您不需要使用Java作为语言或正则表达式转义前斜杠。

You don't need to escape forward slashes either in Java as a language or in regular expressions.

if (condition) {
    return true;
} else {
    return false;
}

更紧凑且可读性地写为：

are more compactly and readably written as:

return condition;

所以在你的case，我相信你的方法应该是：

So in your case, I believe your method should be something like:

public boolean checkDate(String dateToCheck) {
    return dateToCheck.matches("[0-9][0-9]/[0-9][0-9]/[0-9][0-9][0-9][0-9]"));
}

请注意，这不是测试有效日期的一种非常好的方法 - 它可能是值得尝试解析为作为一个日期，或者，或者，更理想的是一个API，这将允许你这样做而不抛出异常失败。

Note that this isn't a terribly good way of testing for valid dates - it would probably be worth trying to parse it as a date as well or instead, ideally with an API which will allow you to do this without throwing an exception on failure.

您的正则表达式也可以更简单地写为：

Your regular expression can also be written more simply as:

public boolean checkDate(String dateToCheck) {
    return dateToCheck.matches("[0-9]{2}/[0-9]{2}/[0-9]{4}"));
}

这篇关于Java - 前向斜线逃脱字符的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！