public void addReplacement(int groupIndex, String replacement) {
        if (groupIndex == 0) {
            throw new IllegalArgumentException("regex groups start at 1, not zero");
        }
        replacementTable[groupIndex] = replacement;
    }
This class represents a conversion rule It uses a Pattern and defines for
each capturing group of this Pattern a replacement text

@author jean-noelcharpin
slf4j-migrator/src/main/java/org/slf4j/migrator/line/MultiGroupConversionRule.java