Java模式匹配中提取括号之间的内容

Question

Need to extract content between parentheses for (20) - should return 20 for ("creamy") - should return creamy

I tried with the below pattern matcher but did not work. Can someone help?

Pattern pattern = Pattern.compile("\\((.*?)\\)");

Answer 1

Did you encounter the compiler error on the single \\? For that to compile in Java, you need to escape the backslash otherwise the compiler tries to find the special character (. So it should be:

Pattern pattern = Pattern.compile("\\((.*?)\\)");
Matcher match = pattern.matcher("(cream)");
match.find();
System.out.println(match.group(1));

prints out

cream

Answer 2

Try using regular expression in java. See code snippet below.

String matched = "";
Pattern pattern = Pattern.compile("\\((.*?)\\)");
Matcher matcher = pattern.matcher("(20)");
if (matcher.find()) {
   matched = matcher.group(1);
}
System.out.println(matched);