字符串操作：拆分分隔数据

Question

我需要从星号分隔的数据中拆分一些信息。

数据格式：

NAME*ADRESS LINE1*ADDRESS LINE2

规则：

1. Name should be always present
2. Address Line 1 and 2 might not be
3. There should be always three asterisks.

样品：

MR JONES A ORTEGA*ADDRESS 1*ADDRESS2*

Name: MR JONES A ORTEGA
Address Line1: ADDRESS 1
Address Line2: ADDRESS 2

A PAUL*ADDR1**
Name: A PAUL
Address Line1: ADDR1
Address Line2: Not Given

我的算法是：

1. Iterate through the characters in the line
2. Store all chars in a temp variables until first * is found. Reject the data if no char is found before first occurence of asterisk. If some chars found, use it as the name.
3. Same as step 2 for finding address line 1 and 2 except that this won't reject the data if no char is found

我的算法看起来很丑。代码看起来更丑。使用 //* 进行拆分也不起作用，因为如果数据是 *Address 1*Address2，则名称可以替换为地址行 1。有什么建议吗？

编辑：

尝试使用不包括引号“-MS DEBBIE GREEN*1036 PINEWOOD CRES**”的数据

Answer 1

您可以使用String[] split(String regex, int limit)如下：

    String[] tests = {
        "NAME*ADRESS LINE1*ADDRESS LINE2*",
        "NAME*ADRESS LINE1**",
        "NAME**ADDRESS LINE2*",
        "NAME***",
        "*ADDRESS LINE1*ADDRESS LINE2*",
        "*ADDRESS LINE1**",
        "**ADDRESS LINE2*",
        "***",
        "-MS DEBBIE GREEN*1036 PINEWOOD CRES**",
    };
    for (String test : tests) {
        test = test.substring(0, test.length() - 1);
        String[] parts = test.split("\\*", 3);
        System.out.printf(
            "%s%n  Name: %s%n  Address Line1: %s%n  Address Line2: %s%n%n",
            test, parts[0], parts[1], parts[2]
        );
    }

打印内容（如 ideone.com 上所示）：

NAME*ADRESS LINE1*ADDRESS LINE2*
  Name: NAME
  Address Line1: ADRESS LINE1
  Address Line2: ADDRESS LINE2

NAME*ADRESS LINE1**
  Name: NAME
  Address Line1: ADRESS LINE1
  Address Line2: 

NAME**ADDRESS LINE2*
  Name: NAME
  Address Line1: 
  Address Line2: ADDRESS LINE2

NAME***
  Name: NAME
  Address Line1: 
  Address Line2: 

*ADDRESS LINE1*ADDRESS LINE2*
  Name: 
  Address Line1: ADDRESS LINE1
  Address Line2: ADDRESS LINE2

*ADDRESS LINE1**
  Name: 
  Address Line1: ADDRESS LINE1
  Address Line2: 

**ADDRESS LINE2*
  Name: 
  Address Line1: 
  Address Line2: ADDRESS LINE2

***
  Name: 
  Address Line1: 
  Address Line2: 

-MS DEBBIE GREEN*1036 PINEWOOD CRES**
  Name: -MS DEBBIE GREEN
  Address Line1: 1036 PINEWOOD CRES
  Address Line2: 

的原因"\\*"是因为split需要一个正则表达式，并且*是一个正则表达式元字符，并且由于您希望它按字面意思表示，因此需要使用 进行转义\。由于\它本身是Java字符串转义字符，因此要\在字符串中获取a，您需要将其加倍。

limit使用of的原因3是因为您希望数组由 3 个部分组成，包括尾随空字符串。limit默认情况下，-less会split丢弃尾随的空字符串。

最后一个在执行*之前被手动丢弃split。