import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "^([gG][iI][rR] ?0[aA][aA])$|^((([a-zA-Z][0-9][0-9]?)|(([a-zA-Z][a-hA-Hj-yJ-Y][0-9][0-9]?)|(([a-zA-Z][0-9][a-zA-Z])|([a-zA-Z][a-hA-Hj-yJ-Y][0-9]?[a-zA-Z])))) ?[0-9][a-zA-Z]{2})$";
final String string = "AAA 1QG\n"
+ "gir 0aa\n"
+ "GIR0AA\n"
+ "gIR 0AA\n"
+ "giR 0AA\n"
+ "ig6 1qg\n"
+ "ig61qg\n"
+ "IG6 1QG\n"
+ "n22 5bp\n"
+ "n225bp\n"
+ "N22 5BP\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