import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "^(?P<datetime>\\d{2}/\\d{2}/\\d{4}[^-]+)\\s+-\\s+(?P<name>[^:]+):\\s+(?P<message>[\\s\\S]+?)(?=^\\d{2}|\\Z)";
final String string = "03/01/2021, 10:06 - Messages and calls are end-to-end encrypted. No one outside of this chat, not even WhatsApp, can read or listen to them. Tap to learn more.\n"
+ "21/06/2018, 07:47 - +234 806 679 5599 created group \"Keremor Barging\"\n"
+ "03/01/2021, 08:48 - John C. added you\n"
+ "03/01/2021, 08:49 - +234 703 803 5040: Waiting for this message\n"
+ "03/01/2021, 08:49 - +234 703 803 5040: Waiting for this 03/01/2021 message\n"
+ "04/01/2021, 08:06 - +234 703 803 5040:Ugo-Ocha Terminal. \n\n"
+ "No STS operation was carried out.\n\n"
+ "Total volume Onboard Ugo Ocha As at 0800hrs 04/01/2021 remain the same";
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