Question

我想解析命令的结果并将其保存到列表中：

Process Pid Mello       No  Status
122     523 GFAF_0      1   Running
125     512 GFAF_235    2   Running
128     987 GFAF_1      3   Stopped

预期产出：

[GFAF_0,GFAF_235,GFAF_1]

我希望GFAF_XYZ（XYZ是数字）的正则表达式，但我找不到办法。

此致达米安

Answer 1

我觉得你看起来像getopt

您需要根据输入格式指定选项

OptSpecList =
    [
     {host,    $h,        "host",    {string, "localhost"}, "Database server host"},
     {port,    $p,        "port",    integer,               "Database server port"},
     {dbname,  undefined, "dbname",  {string, "users"},     "Database name"},
     {xml,     $x,        undefined, undefined,             "Output data in XML"},
     {verbose, $v,        "verbose", integer,               "Verbosity level"},
     {file,    undefined, undefined, string,                "Output file"}
    ].

然后致电getopt:parse/2:

getopt:parse(OptSpecList, ["-h", "myhost", "--port=1000", "-x", "file.txt", "-vvv", "dummy1", "dummy2"]).

你会得到元组

{ok,{[{host,"myhost"},
      {port,1000},
      xml,
      {file,"file.txt"},
      {dbname,"users"},
      {verbose,3}],
     ["dummy1","dummy2"]}}

OR超简单解决方案

如果您以字符串形式接收数据，例如

"Process Pid Mello No Status 122 523 GFAF_0 1 Running 125 512 GFAF_235 2 Running 128 987 GFAF_1 3 Stopped"

按字词分组

L = string:tokens("Process Pid Mello No Status 122 523 GFAF_0 1 Running 125 512 GFAF_235 2 Running 128 987 GFAF_1 3 Stopped", " ").

["Process","Pid","Mello","No","Status","122","523","GFAF_0",
 "1","Running","125","512","GFAF_235","2","Running","128",
 "987","GFAF_1","3","Stopped"]

并检查元素是否包含“GFAF_”前缀

F = fun(Elem, Acc) ->
    case string:find(Elem, "GFAF_", trailing) of
      nomatch -> Acc;
      _ -> [Elem|Acc]
    end end,
  lists:foldl(F, [], L).

您将收到列表

["GFAF_1","GFAF_235","GFAF_0"]

解析命令输出并将其保存到列表中

1 个答案: