Query a special string

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• Thursday, October 29, 2009 8:32 AMVadims PodansMVP

   
  

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  sure:

  # retrieve log file content
  $log = gc desktop\log.txt 
  # looping each line
  for ($n = 0; $n -lt $log.count-1; $n++) {
  # check if current string contains an IP address. If it is, capture this by using IP-address pattern
      if ($log[$n] -match "ping ([\d\.]+) \.{3}") {
  # if IP address is caputured, writing this address to variable
          $ip = $matches[1]
  # check if next line contains timed out string by exact equality. If
  # ping is timed out, return IP address and looping to next line...
          if ($log[$n+1] -eq "ping .. Error: Request timed out") {$ip}
      }    
  }

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  http://www.sysadmins.lv

  • Marked As Answer byMarco ShawMVP, ModeratorThursday, October 29, 2009 10:11 AM
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• Thursday, October 29, 2009 9:37 AMGlaziz.Chen

   
  

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  Thanks, it is useful for me.
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• Thursday, October 29, 2009 9:55 AMGlaziz.Chen

   
  

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  Hi,

  
  

  I do not understand this line.  if ($log[$n] -match "ping ([\d\.]+) \.{3}") {

  
  

  could you explain it from ([\d\.]+) \.{3}

  or where i can find the relation syntax? I think this is very useful for me to deal further program.

  Thanks,

  
  
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• Friday, October 30, 2009 7:31 AMVincentK

   
  

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  Its a regular Expression. I found this site very usefull in understanding those: http://www.regular-expressions.info/

  • Proposed As Answer byVadims PodansMVPFriday, October 30, 2009 8:02 AM
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• Friday, October 30, 2009 8:01 AMVadims PodansMVP

   
  

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  \d - any digit
  \. - any dot
  [\d\.] - digit or dot
  [\d\.]+ - one or more digit or dot
  \.{3} - three dots

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  • Proposed As Answer byVadims PodansMVPFriday, October 30, 2009 8:02 AM
  • Marked As Answer byMervyn ZhangMSFT, ModeratorTuesday, November 03, 2009 5:28 AM
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• Wednesday, November 04, 2009 7:52 AMGlaziz.Chen

   
  

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  \d - any digit
  \. - any dot
  [\d\.] - digit or dot
  [\d\.]+ - one or more digit or dot
  \.{3} - three dots

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  http://www.sysadmins.lv

  Hi,

  
  

  I follow your guide and adjust my script for try to match two strings. One likes ABC123 and the other likes CONABC.

  The first one format will be the first three letters are English alphabets and the last three letters are Arabic numeral.

  The second one format will be the first three letters are "CON" and the last three letters are English alphabets.

  I can draft "[a-z]\d{3}" for first one and "con[a-z]{3}" for seconds. However i want to combine two expression into one line.

  The program will can identify both format. Could someone help me? 

  Thanks,

  
  
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• Wednesday, November 04, 2009 8:30 AMVadims PodansMVP

   
  

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  can you provide example string?

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