Regex to match "square brackets", "double quotes"

　　Requirement: get 1,2,3 from the string ["1","2","3"]

　　Method: think of many methods, you can replace it step by step. Here is a simpler method

String str = "[\"1\",\"2\",\"3\"]";

String reg = "[\\["\\]]";
str =  str.replaceAll(reg,"");

　　result:

　　　　str=“1,2,3”;