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

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)); } 

Answer 2

You should use a positive lookahead and lookbehind:

(?<=\[)([^\]]+)(?=\]) 

• (?<=[) Matches everything followed by [
• ([^]]+) Matches any string not containing ]
• (?=]) Matches everything before ]