There is also regex101.com. It is my favourite personal. It highlights individual parts of the regex and provides human explanation, e.g. https://regex101.com/

There is also regex101.com. It is my favourite personal. It highlights individual parts of the regex and provides human explanation, e.g. https://regex101.com/r/xKG7pE/1 https://regex101.com/r/xKG7pE/1