替换所有以空格分隔的字符串

Question

我试图替换一些由空格分隔的字符串。模式匹配按预期工作，但在替换时，空白也被替换（如下面的例子中的换行符），这是我想避免的。这是我到目前为止有：

String myString = "foo bar,\n"+ 
        "is a special string composed of foo bar and\n"+ 
        "it is foo bar\n"+ 
        "is indeed special!"; 

String from = "foo bar"; 
String to = "bar foo"; 
myString = myString.replaceAll(from + "\\s+", to) 

expected output = "foo bar, 
        is a special string composed of bar foo and 
        it is bar foo 
        is indeed special!"; 


actual output = "foo bar, 
       is a special string composed of bar foo and 
       it is bar foo is indeed special!"; 

Answer 1

比赛和捕捉空白在from字符串的结尾，然后用它替换：

String from = "foo bar"; 
String to = "bar foo"; 
myString = myString.replaceAll(from + "(\\s+)", to + "$1"); 
System.out.println(myString); 

请注意，你也可以只是使用单个字符串foo bar\\s+作为模式，但也许你不想要这样，因为你希望模式是灵活的。

输出：

foo bar, 
is a special string composed of bar foo and 
it is bar foo 
is indeed special!