I need the value in parentheses for the annotation in the text field. Example:
String text = "I have simple annotation @Test(value123) and ..
I can find the annotation itself with a value, but I don't understand how to get it without an annotation
Pattern patternString = Pattern.compile("@Test\\(\\s+\\)");
Result:
@Test(value123)
but I need
value123
Add a (X) capturing group:
String text = "I have simple annotation @Test(value123) and ..";
Pattern p = Pattern.compile("@Test\\(([^)]*)\\)");
Matcher m = p.matcher(text);
if (m.find()) {
System.out.println(m.group(1)); // Print capture group 1
}
Output
value123
Explanation
@Test\( Match '@Test('
( Start of capturing group 1
[^)]* Match zero-or-more characters, except ')'
) End of capturing group 1
\) Match ')'
Alternatively, use (?<=X) zero-width positive lookbehind and (?=X) zero-width positive lookahead:
String text = "I have simple annotation @Test(value123) and ..";
Pattern p = Pattern.compile("(?<=@Test\\()[^)]*(?=\\))");
Matcher m = p.matcher(text);
if (m.find()) {
System.out.println(m.group()); // Print matched text
}
Output
value123
Explanation
(?<= Start of zero-width positive lookbehind
@Test\( Match '@Test('
) End of zero-width positive lookbehind
[^)]* Match zero-or-more characters, except ')'
(?= Start of zero-width positive lookahead
\) Match ')'
) End of zero-width positive lookahead
You can use a matcher, like this:
import java.util.regex.Pattern;
import java.util.regex.Matcher;
class Main {
public static void main(String[] args) {
String testString = "@Test(value123)";
// unescaped parentheses catch the group
// note that I changed \\s+ to .+,
// since I want to match whatever is inside the parentheses,
// not whitespaces (however, you should adjust it to your needs)
Pattern pattern = Pattern.compile("@Test\\((.+)\\)");
Matcher matcher = pattern.matcher(testString);
if (matcher.matches()) {
String value = matcher.group(1);
System.out.println(value); // prints value123
}
}
}
