import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "\\b(?:\\d{6} \\d{5}|[1-9]\\d{4} \\d{5}|[1-9]\\d{9}|\\d{11})\\b";
final String string = "Pattern 1 - The length of this pattern is exactly 10 and cannot start with a zero. These consist of only integers. Ex: '1234567890'\n\n"
+ "Pattern 2 - The length of this pattern is exactly 11 and can start with a zero. These consist of only integers. Ex: '01234567890'\n\n"
+ "Pattern 3 - The length of this pattern is exactly 11 and cannot start with a zero. There is one space after the 5th number and all other characters are numbers. Ex: '12345 67890'\n\n"
+ "Pattern 4 - The length of this pattern is exactly 12 and can start with a zero. There is one space after the 6th number and all other characters are numbers. Ex: '012345 67890'\n\n"
+ "Note - The example pattern example provided is for representation only. The actual set of numbers in my string can be anything. Example: '2345653340' or '034945 85730' or '000000 00000' or '09876543210'.";
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