Issue moving from openHab 2.2 to latest 2.3 - String index out of range: -2

[sipvoip (Nathan Stratton)]

Error executing the transformation 'JSONPATH': An error occured while transforming JSON expression

.indexOf(' ') instead of .indexOf(']') for that one I guess. A more general solution for all of these would be .replaceAll("[^\\d.-]", "") instead of .subString(...), meaning, any non digit, decimal or minus sign? Throw it away.