reduced size and added fix for https://stackoverflow.com/questions/1293147/javascript-code-to-parse-csv-data

csvStringToArray.js

const csvStringToArray = strData =>
{
    const objPattern = new RegExp(("(\\,|\\r?\\n|\\r|^)(?:\"([^\"]*(?:\"\"[^\"]*)*)\"|([^\\,\\r\\n]*))"),"gi");
    let arrMatches = null, arrData = [[]];
    while (arrMatches = objPattern.exec(strData)){
        if (arrMatches[1].length && arrMatches[1] !== ",")arrData.push([]);
        arrData[arrData.length - 1].push(arrMatches[2] ? 
            arrMatches[2].replace(new RegExp( "\"\"", "g" ), "\"") :
            arrMatches[3]);
    }
    return arrData;
}

What exactly is the condition for breaking out of this while statement?

What exactly is the condition for breaking out of this while statement?

When arrMatches value is no longer truthy. aka when RegExp.exec (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp/exec) returns null instead of a value.