javascript - What does this regular expression mean /(?:([^:;\(\[]*):)?(.*)/

Question

/(?:([^:;\(\[]*):)?(.*)/

Can you explain it in detail?

Answer 1

Part one: (?:XXXXX:)?
Part two: (.*)

The first part, does not match one or zero XXXXX:, XXXXX matches zero or more of these:;([Any characters other than the symbol, which is captured by the first capturing group.

The second part is to capture zero or more arbitrary characters.

Answer 2

As explained on the first floor, there are two capture groups. The content of the brackets in the first capture group is after ([^:;([]*)指匹配不包含:;（[字符的任意个字符，加上前面的 ?:表示只匹配括号里面的内容但是不捕获，最后是匹配一个:,
(?:([^:;([]*):)?, 匹配一个不包含:;（[这四个符号的字符串再加一个:零次或一次；
第二个捕获组就是捕获任意字符串，就是说如果第一个捕获组匹配失败，那么第二个捕获组会获取整个字符串，
如果第一个捕获组成功，结果是捕获两个字符串，一个是:之前的，一个是:;
Example:

var re = /(?:([^:;\(\[]*):)?(.*)/;
re.exec('abc:123');
==>  ["abc:123", "abc", "123", index: 0, input: "abc:123"]
re.exec('(abc:123');
==>  ["(abc:123", undefined, "(abc:123", index: 0, input: "(abc:123"]