正则表达式-仅读取前4行 [英] Regular expression - reading only first 4 lines

问题描述

伙计们，

我有一个关于正则表达式的问题.

我必须从``EFF:''之后的文本中获取数据(8个字符). 1-4行之间的任何位置，但只有第一个匹配项.文本可以超过10行.让我知道如何限制正则表达式最多只能读取4行. (在这里输入是行的结尾)在此先感谢

文字:

H 01/05/2006 16:34:11 MUNI/CORP 2 16706 1 .................................... ENT:01/05/06:(2006)
DEAL#:1 :TEXT#:1928906:备注:CUSIP#CHG:IND:= N M: EFF :05/01/09:(2009)
TARGET :6497168M2::纽约C:INIT:64971K6F8::9999999999:EXP:05/01/09:(2009)
CASH:1010.00000:::A:STATE:NY:T.AGENT:M012:INFO: EFF ::MAT:05/01/29:(2029)
RATE:5.00000::::1.00000:M:DTC::PRATE:0.000000: PRO:12/28/05:(2005)
DESC. 1:纽约市过渡性金融管理局
DESC. 2:未来税收第二笔收入债券
DESC. 3:系列1999 C MBIA-IBC
EFF :asdwetrt div>

您可以尝试以下方法:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;


namespace ConsoleApplication1
{
  class Program
  {
    static void Main(string[] args)
    {
      //Your example string
      string text = @"H   01/05/2006 16:34:11 MUNI/CORP  2 16706 1               
              ........................................................... ENT:01/05/06:(2006) 
              DEAL#: 1: TEXT#:1928906: REMARKS:CUSIP # CHG :  IND:=N M: EFF:05/01/09:(2009) 
              TARGET:6497168M2: :NEW YORK C: INIT:64971K6F8: :9999999999: EXP:05/01/09:(2009) 
              CASH:1010.00000: :A:  STATE:NY: T.AGENT:M012: INFO: EFF:  : MAT:05/01/29:(2029) 
              RATE:  5.00000: : : : 1.00000:M:DTC: : PRATE: 0.000000: PRO:12/28/05:(2005) 
              DESC. 1: NEW YORK CITY TRANSITIONAL FINANCE AUTHORITY              
              DESC. 2: FUTURE TAX SECOND REVENUE BONDS                    
              DESC. 3: SERIES 1999 C MBIA-IBC 
              EFF:asdwetrt  ";

      //Split your string up by using the carriage return escape charater.
      string[] textSplit= text.Split('\r');

      //The regex to find your data
      Regex expression = new Regex("[E][F][F][:]");

      //A list to hold the data you find
      List<string> foundData = new List<string>();

      //This sets the loop to look in only the frist 4 lines of text
      //We can do this because we split it by the carriage return
      for (int x = 0; x < 4;x++ )
      {
        //Looks for "EFF: in only one line of the text"
        Match found = expression.Match(textSplit[x]);
        
        //If it finds something
        if (found.Success)
        {
          //We need to add 4 to the index it was found at because it gives
          //the index of the first charater of "EFF:"
          int foundindex = found.Index + 4;

          //This then gets the next 8 chars after the "EFF:"
          string whatyourlookingfor = textSplit[x].Substring(foundindex, 8);
          
          //Add it to the list
          foundData.Add(whatyourlookingfor);

          //This displays the data.
          Console.WriteLine(whatyourlookingfor);
        }
      }
    }
  }
}

 

Hi Guys,

   I have one problem regarding the regular expression.

  I have to fetch the data (8 chars) from the text which starts after "EFF:" anywhere between 1-4 lines but only the first match. the text can have more than 10 lines. let me know how to restrict the regex for reading upto only 4 lines. (here enter is the end of line) Thanks in advance

Text:

   H      01/05/2006 16:34:11 MUNI/CORP   2  16706 1                            
........................................................... ENT:01/05/06:(2006)
DEAL#: 1: TEXT#:1928906: REMARKS:CUSIP # CHG :   IND:=N  M: EFF:05/01/09:(2009)
TARGET:6497168M2: :NEW YORK C: INIT:64971K6F8: :9999999999: EXP:05/01/09:(2009)
CASH:1010.00000:  :A:   STATE:NY:  T.AGENT:M012: INFO: EFF:   : MAT:05/01/29:(2029)
RATE:   5.00000:  : : :  1.00000:M:DTC: : PRATE:  0.000000: PRO:12/28/05:(2005)
DESC. 1: NEW YORK CITY TRANSITIONAL FINANCE AUTHORITY                          
DESC. 2: FUTURE TAX SECOND REVENUE BONDS                                       
DESC. 3: SERIES 1999 C  MBIA-IBC
EFF:asdwetrt                                              

解决方案

You could try this:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;


namespace ConsoleApplication1
{
  class Program
  {
    static void Main(string[] args)
    {
      //Your example string
      string text = @"H   01/05/2006 16:34:11 MUNI/CORP  2 16706 1               
              ........................................................... ENT:01/05/06:(2006) 
              DEAL#: 1: TEXT#:1928906: REMARKS:CUSIP # CHG :  IND:=N M: EFF:05/01/09:(2009) 
              TARGET:6497168M2: :NEW YORK C: INIT:64971K6F8: :9999999999: EXP:05/01/09:(2009) 
              CASH:1010.00000: :A:  STATE:NY: T.AGENT:M012: INFO: EFF:  : MAT:05/01/29:(2029) 
              RATE:  5.00000: : : : 1.00000:M:DTC: : PRATE: 0.000000: PRO:12/28/05:(2005) 
              DESC. 1: NEW YORK CITY TRANSITIONAL FINANCE AUTHORITY              
              DESC. 2: FUTURE TAX SECOND REVENUE BONDS                    
              DESC. 3: SERIES 1999 C MBIA-IBC 
              EFF:asdwetrt  ";

      //Split your string up by using the carriage return escape charater.
      string[] textSplit= text.Split('\r');

      //The regex to find your data
      Regex expression = new Regex("[E][F][F][:]");

      //A list to hold the data you find
      List<string> foundData = new List<string>();

      //This sets the loop to look in only the frist 4 lines of text
      //We can do this because we split it by the carriage return
      for (int x = 0; x < 4;x++ )
      {
        //Looks for "EFF: in only one line of the text"
        Match found = expression.Match(textSplit[x]);
        
        //If it finds something
        if (found.Success)
        {
          //We need to add 4 to the index it was found at because it gives
          //the index of the first charater of "EFF:"
          int foundindex = found.Index + 4;

          //This then gets the next 8 chars after the "EFF:"
          string whatyourlookingfor = textSplit[x].Substring(foundindex, 8);
          
          //Add it to the list
          foundData.Add(whatyourlookingfor);

          //This displays the data.
          Console.WriteLine(whatyourlookingfor);
        }
      }
    }
  }
}

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