import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "(?:rgb(?:a|)\\s*|#)(?:\\(|)\\s*(25[0-5]|2[0-4][0-9]|1[0-9]?[0-9]?|[1-9][0-9]?|[0-9]|[A-Fa-f0-9]{2}|[A-Fa-f0-9]{2})(?:\\,|)\\s*(25[0-5]|2[0-4][0-9]|1[0-9]?[0-9]?|[1-9][0-9]?|[0-9]|[A-Fa-f0-9]{2}|[A-Fa-f0-9]{2})(?:\\,|)(?:\\,|)\\s*(25[0-5]|2[0-4][0-9]|1[0-9]?[0-9]?|[1-9][0-9]?|[0-9]|[A-Fa-f0-9]{2}|[A-Fa-f0-9]{2}).+";
final String string = "\n\n"
+ "#3498db\n"
+ "rgb(231, 76, 60)\n"
+ "rgb(155, 89, 182)\n"
+ "rgba(46, 204, 113,1.0)\n\n\n"
+ "rgba ( 52, 152, 219,1.0)";
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