import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "^(?=.{5}$)[a-z]*\\d[a-z]*$";
final String string = "jlwk6\n"
+ "bjkgp\n"
+ "5fm8s\n"
+ "x975t\n"
+ "k88q5\n"
+ "zl796\n"
+ "qm9hb\n"
+ "h6gtf\n"
+ "9rm9p\n"
+ "jwzw2";
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