MongoDB Java Driver Filter for equals ignore case / case insensitive

MongoFilters.java

import com.mongodb.client.model.Filters;
import org.bson.conversions.Bson;

import java.util.regex.Pattern;

public class MongoFilters {

    public static Bson eqIgn(String fieldName, String value) {
        String patternString = new StringBuilder("(?i)^").append(value).append("$").toString();
        Pattern pattern = Pattern.compile(patternString, Pattern.CASE_INSENSITIVE);
        return Filters.regex(fieldName, pattern);
    }
    
    public static Bson notEqIgn(String fieldName, String value) {
        return Filters.not(eqIgn(fieldName, value));
    }
  
}