About advanced replacement of javascript regular expressions

This time I will bring you the advanced replacement method of JavaScript regular expressions. The following is a case, follow the editor to take a look.

Ordinary regular replacement generally replaces the first matched value or all matched values ​​replaces ,

For example:

"abc,abc,ab".replace(/a/,'1');

Result: "1bc,abc,ab";

##"abc,abc,ab".replace(/a/g ,'1');

Result: "1bc,1bc,1b"

Advanced point Replacement: Replace the third digit of the IP address with *.

192.168.33.12 becomes 192.168.*.12

##"192.168.33.12".replace (/(\d{1,3}).(\d{1,3}).(\d{1,3}).(\d{1,3})/,"$1.$2.*. $4")

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