Split string on the first occurrence of underscore using kettle

Having a string contain underscore (string can have multiple underscores), want to split on first occurrence of underscore into two parts in kettle. To achieve this I used ‘Java Script’ step, which is quite easy and can perform using single step.

Below is the code for ‘Modified Java Script Value’ step:

var ToBeSplit = InString;

var IndexLevel = ToBeSplit.indexOf("_");

var LeftTrim = ToBeSplit.substr('_',IndexLevel);

var RightTrim = ToBeSplit.substr(IndexLevel+1);