Node.js Path模块源码两个常规表达

Question

I am confused with 2 regex in the node.js path module source

// Regex to split a windows path into three parts: [*, device, slash,
// tail] windows-only
var splitDeviceRe =
    /^([a-zA-Z]:|[\\\/]{2}[^\\\/]+[\\\/]+[^\\\/]+)?([\\\/])?([\s\S]*?)$/;

// Regex to split the tail part of the above into [*, dir, basename, ext]
var splitTailRe =
    /^([\s\S]*?)((?:\.{1,2}|[^\\\/]+?|)(\.[^.\/\\]*|))(?:[\\\/]*)$/;

How dose splitTailRe work? most confused with the group: "((?:\\.{1,2}|[^\\\\\\/]+?|)(\\.[^.\\/\\\\]*|))"

Answer 1

This may be of some help to you

splitDeviceRE = https://regex101.com/r/mV5gS0/2

splitTailRe = https://regex101.com/r/mV5gS0/1

It breaks down the regex you feed it and explains step by step what each 'section' of Regex is doing.