/**
 * 正则表达式字符串替换
 * @param content 字符串
 * @param pattern 正则表达式
 * @param newString 新的替换字符串
 * @return 返回替换后的字符串
 */
public static String regReplace(String content,String pattern,String newString){
   Pattern p = Pattern.compile(pattern);
   Matcher m = p.matcher(content);
   String result = m.replaceAll(newString);
   return result;
}

System.out.println(regReplace("2020-12-12 15:03:06","[0-9][0-9]:","00:"));

2020-12-12 00:00:06

字符串正则替换