java regular expression to extract content within square brackets

Question

input line is below

Item(s): [item1.test],[item2.qa],[item3.production]

Can you help me write a Java regular expression to extract

item1.test,item2.qa,item3.production

from above input line?

Answer 1

I would split after trimming preceding or trailing junk:

String s = "Item(s): [item1.test], [item2.qa],[item3.production] ";
String[] ss = s.replaceAll("(^.*?\\[|\\]\\s*$)","").split("\\]\\s*,\\s*\\[");
// ss = {"item1.test", "item2.qa", "item3.production"};

Answer 2

A bit more concise:

String in = "Item(s): [item1.test],[item2.qa],[item3.production]";

Pattern p = Pattern.compile("\\[(.*?)\\]");
Matcher m = p.matcher(in);

while(m.find()) {
    System.out.println(m.group(1));
}