如何使用正则表达式查找子字符串

UDF2<String, String, Boolean> contains = new UDF2<String, String, Boolean>() {
 private static final long serialVersionUID = -5239951370238629896L;
 @Override
     public Boolean call(String t1, String t2) throws Exception {
        Pattern p1 = Pattern.compile(t1);
        Pattern p2 = Pattern.compile(t2);
        return  p1.toString().contains(p2.toString());
     }
 };
 spark.udf().register("contains", contains, DataTypes.BooleanType);
UDF2<String, String, Boolean> contains = new UD