正则 查找字符 并替换
如字符串："asdasd:"123" , a:"null""

替换成"asdasd:"123" , a:null"



[解决办法]

String str_content = "\"asdasd:\"123\" , a:\"null\"\"";
String model="";
Pattern pattern2 = Pattern.compile("a:\"null\"\"");
Matcher matcher2 = pattern2.matcher(str_content);
if (matcher2.find()) {
model=matcher2.replaceAll("a:null\"");
}

       String str_content = "asdasd:\"123\" , a:\"null\"";   
    String model="";       
    Pattern pattern2 = Pattern.compile(":\"null\"");   
    Matcher matcher2 = pattern2.matcher(str_content);      
    if (matcher2.find()) {       
    model=matcher2.replaceAll(":null"); 
    }
        System.out.println(model);
    }