public MarcField matchValue(Pattern pattern) {
        if (value != null && pattern.matcher(value).matches()) {
            return this;
        }
        for (Subfield subfield : subfields) {
            if (pattern.matcher(subfield.getValue()).matches()) {
                return this;
            }
        }
        return null;
    }
public MarcField matchValue ( Pattern pattern ) { if ( value != null && pattern . matcher ( value ) . matches ( ) ) { return this ; } for ( Subfield subfield : subfields ) { if ( pattern . matcher ( subfield . getValue ( ) ) . matches ( ) ) { return this ; } } return null ; }
Search for fields that match a pattern.
@param pattern the pattern to match
@return thhis MARC field if pattern matches, or null if not