java Java拆分正则表达式

Java split regular expression

提问by Danny King

If I have a string, e.g.

如果我有一个字符串，例如

setting=value

How can I remove the '=' and turn that into two separate strings containing 'setting' and 'value' respectively?

如何删除“=”并将其转换为两个单独的字符串，分别包含“设置”和“值”？

Thanks very much!

非常感谢！

回答by cletus

Two options spring to mind.

两个选项浮现在脑海中。

The first split()s the Stringon =:

第一个split()S中String上=：

String[] pieces = s.split("=", 2);
String name = pieces[0];
String value = pieces.length > 1 ? pieces[1] : null;

The second uses regexes directly to parse the String:

第二个直接使用正则表达式来解析String：

Pattern p = Pattern.compile("(.*?)=(.*)");
Matcher m = p.matcher(s);
if (m.matches()) {
  String name = m.group(1);
  String value = m.group(2);      
}

The second gives you more power. For example you can automatically lose white space if you change the pattern to:

第二个给你更多的力量。例如，如果将模式更改为：

Pattern p = Pattern.compile("\s*(.*?)\s*=\s*(.*)\s*");

回答by Michael Mrozek

You don't need a regular expression for this, just do:

您不需要为此使用正则表达式，只需执行以下操作：

String str = "setting=value";
String[] split = str.split("=");
// str[0] == "setting", str[1] == "value"

You might want to set a limitif valuecan have an =in it too; see the javadoc

你可能想设置一个limitifvalue也可以有一个=；见javadoc