java - 使用正则表达式替换不在括号中的逗号

Question

我有这个字符串:

john(man,24,engineer),smith(man,23),lucy(female) 

如何用 @ 替换不在括号中的逗号？

结果应该是:

john(man,24,engineer)@smith(man,23)@lucy(female)

我的代码:

String str = "john(man,24,engineer),smith(man,23),lucy(female)";
Pattern p = Pattern.compile(".*?(?:\\(.*?\\)).+?");
Matcher m = p.matcher(str);
System.out.println(m.matches()+"  "+m.find());

为什么m.matches()为真而m.find()为假？我怎样才能实现这个目标？

Answer 1

使用负前瞻来实现这一点:

,(?![^()]*\))

说明:

,         # Match a literal ','
(?!       # Start of negative lookahead
  [^()]*  # Match any character except '(' & ')', zero or more times
  \)      # Followed by a literal ')'
)         # End of lookahead

Regex101 Demo