import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "^((['\"])|\\()(.*)(?(?=\\2)(\\2)|(\\)))$";
final String string = "(hello)\n"
+ "'hello'\n"
+ "\"hello\"\n"
+ "(hello (world))\n"
+ "\"hello 'world'\"\n"
+ "(hello \"world\")\n"
+ "\"hello (world)\"\n"
+ "\"\"\n"
+ "''\n"
+ "()\n"
+ "'\"hello world'\n"
+ "\"'hello world\"\n"
+ "((\n"
+ "))\n"
+ "'\"\n"
+ "'\"\n"
+ "(hello(\n"
+ ")hello)\n"
+ "\"hello'\n"
+ "\"hello world'\n"
+ "'hello world\"\n"
+ "'\"hello world'\"\n\n";
final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE);
final Matcher matcher = pattern.matcher(string);
while (matcher.find()) {
System.out.println("Full match: " + matcher.group(0));
for (int i = 1; i <= matcher.groupCount(); i++) {
System.out.println("Group " + i + ": " + matcher.group(i));
}
}
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html