regex is quite powerful and free anyway, I would consider some of these opensource tools to tackle its complexity: http://regex.inginf.units.it/ http://regex.i

regex is quite powerful and free anyway, I would consider some of these opensource tools to tackle its complexity: http://regex.inginf.units.it/ http://regex.inginf.units.it/ http://buildregex.com/ http://buildregex.com/ https://regexr.com/ https://regexr.com/