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String key = "key1"; //取key1所在的json字符串
String s = ",{a:1, b:key, c:3},{a:1, b:key1, c:3},{a:1, b:key2, c:3},{a:1, b:key3, c:3},{a:1, b:key4, c:3},";
Matcher m = Pattern.compile(String.format("[{][^{}]*?%s[^{}]*[}]", key)).matcher(s);
while (m.find()) {
System.out.println(m.group());
}
String s = ",{a:1, b:key, c:3},{a:1, b:key1, c:3},{a:1, b:key2, c:3},{a:1, b:key3, c:3},{a:1, b:key4, c:3},";
Matcher m = Pattern.compile("[{][^{}]*?key[^{}]*[}]").matcher(s);
while (m.find()) {
System.out.println(m.group());
}
String s = ",{a:1, b:key, c:3},{a:1, b:key1, c:3},{a:1, b:key2, c:3},{a:1, b:key3, c:3},{a:1, b:key4, c:3},";
String[] sa = s.replaceAll("^[,]", "").split("(?<=[}]),"); //去掉开头的逗号,再按},分割
for (String ss : sa) {
System.out.println(ss);
}