如何使用模式匹配获取某个字符后的String？

Question

String tect = "A to B";
Pattern ptrn = Pattern.compile("\\b(A.*)\\b");
Matcher mtchr = ptrn.matcher(tr.text()); 
while(mtchr.find()) {
    System.out.println( mtchr.group(1) );
}

I am getting output A to B but I want to B .

Please help me.

Answer 1

You can just place the A outside of your capturing group.

String s  = "A to B";
Pattern p = Pattern.compile("A *(.*)");
Matcher m = p.matcher(s);
while (m.find()) {
  System.out.println(m.group(1)); // "to B"
}

You could also split the string.

String s = "A to B";
String[] parts = s.split("A *");
System.out.println(parts[1]); // "to B"

Answer 2

更改模式以使用A的后视可能断言检查：

Pattern ptrn = Pattern.compile("(?<=A)(.*)");

Answer 3

你可以在一行中完成：

String afterA = str.replaceAll(".*?A *", ""),