const regex = /\G\s*+((\((?:\s*+(?2)\s*+(?(?!\)),)|\s*+[^()',\s]++\s*+(?(?!\)),)|\s*+'[^'\r\n]*+'\s*+(?(?!\)),))++\))|[^()',\s]++|'[^'\r\n]*+')\s*+(?:,|$)/g;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('\\G\\s*+((\\((?:\\s*+(?2)\\s*+(?(?!\\)),)|\\s*+[^()\',\\s]++\\s*+(?(?!\\)),)|\\s*+\'[^\'\\r\\n]*+\'\\s*+(?(?!\\)),))++\\))|[^()\',\\s]++|\'[^\'\\r\\n]*+\')\\s*+(?:,|$)', 'g')
const str = `65.54.188.59 - - [13/Jul/2005:04:10:13 +0200] "GET /fusel/Suchmaschinen.html HTTP/1.0" 404 302 "-" "msnbot/1.0 (+http://search.msn.com/msnbot.htm)"`;
const subst = `\n`;
// The substituted value will be contained in the result variable
const result = str.replace(regex, subst);
console.log('Substitution result: ', result);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions