java - 如何为以下字符串编写正则表达式？

Question

在给定的字符串中，我只想提取“ENERGY:”之后的字符串

1562173405047|INFO|MyHalfDuplexModem@30:println|ENERGY: -s 1 -d 2 -b 288 -e 9.999788799994675071125   T   {-s 1, -d 2 }
1562173405552|INFO|MyHalfDuplexModem@43:println|ENERGY: -s 3 -d 2 -b 96 -e 9.999779196127731100294   R   {-s 3, -d 2 }
1562173406122|INFO|MyHalfDuplexModem@43:println|ENERGY: -s 1 -d 2 -b 288 -e 9.999764796127731100294   R   {-s 1, -d 2 }
1562173406194|INFO|MyHalfDuplexModem@43:println|ENERGY: -s 2 -d 1 -b 96 -e 9.999759995924876667052   T   {-s 2, -d 1 }

这是我的代码:

public static void main(String[] args) {
    //movies = new ArrayList<movie>();
       realPath = "Z:\\UNET\\3 NODE 1 SOURCE\\log-0.txt";
       File f = new File(realPath);
       if ( !f.exists()) {
          System.err.println("file path not specified");
       }
       try {
        String regex1 = "[0-9]+\|INFO\|MyHalfDuplexModem@[0-9]+:println\|ENERGY:";

        Scanner sc = new Scanner(f);

            while (sc.hasNextLine()) {

                String nextLine = sc.nextLine();
                if ( !nextLine.matches(regex1)) {
                     System.out.println(nextLine);
                }


            }   

         //   sc.close();
         } catch(Exception e) {
              throw new RuntimeException(e);
         }
       }

我尝试了以下正则表达式，但它不起作用: regex1 = "[0-9]+[|]INFO[|]MyHalfDuplexModem@[0-9]+:println|ENERGY:";

Answer 1

稍微逃避一下，你应该会很好:

regex1 = "[0-9]+\|INFO\|MyHalfDuplexModem@[0-9]+:println\|ENERGY:";
                                                        ^^ this was the problem
                                                        |
                                                        `- this is the fix

没有转义|是alternation ，有效地产生 "[0-9]+|INFO|MyHalfDuplexModem@[0-9]+:println"OR "ENERGY:"

另请注意，\| 与 [|] 相同。我更喜欢前者。