java中twitter风格的正则表达式匹配

我想提取字符串中“@”对应的单词并将其保存在列表中：

例如：

 "This is @crazy_boy crazy" should give ["crazy_boy"]

 "This is @crazy_boy crazy @foobar" should give ["crazy_boy","foobar"]

 "This statement is boring" should give [] //or whatever is an empty list

String input = "This is @crazy_boy crazy @foobar";
Matcher matcher = Pattern.compile("(?<=@)\\w+").matcher(input);
while (matcher.find())
  System.out.println(matcher.group());

用python

  targets = re.findall(r'(?<=@)\w+', text)

targets=re.findall（r'（？请参阅）。您需要迭代匹配，例如：

 "This is @crazy_boy crazy" should give ["crazy_boy"]

 "This is @crazy_boy crazy @foobar" should give ["crazy_boy","foobar"]

 "This statement is boring" should give [] //or whatever is an empty list

String input = "This is @crazy_boy crazy @foobar";
Matcher matcher = Pattern.compile("(?<=@)\\w+").matcher(input);
while (matcher.find())
  System.out.println(matcher.group());