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POPowershell replace non matching entries
 

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    <p>I have a powershell script that I am working on to edit some text files. So far I have managed to extract all the lines I want to edit using select string, then with some help from an earlier post I have managed to remove all of the information on each line that I don't need. What I want to do next is go through each line and remove any entries that do not match a particular string. So for example, the text file may contain the following entries:</p> <pre><code>"1.1.1.1" "2.2.2.2." "3.3.3.3" "4.4.4.4" "1.2.3.4" "1.2.3.4" "1.1.1.1" "2.2.2.2" "3.3.3.3" "4.4.4.4" </code></pre> <p>I want to strip out anything that isn't either "1.1.1.1" OR "2.2.2.2" OR "3.3.3.3" OR "4.4.4.4"</p> <ul> <li>All the entries are within double quotes</li> <li>The entries that need to be removed may be located anywhere on the line. </li> <li>The entries that need tobe removed differ on each line </li> <li>The entries that need to stay are fixed</li> </ul> <p><strong>Essentially, what I want to do is remove anything that does not match 1 of 6 possible fixed values and leave all other values unaffected.</strong></p> <p>Thus far I've tried using get-content with -replace option, various forms of select-string, regex etc but so far no luck. This is a little bit beyond my Powershell knowledge</p> <p>EDIT:</p> <p><strong>I think the original way I was trying wasn't the right way of going about it and perhaps I didnt phrase the question correctly. I now have all the entries in a csv file, the output of which is similar to the below:</strong></p> <pre><code>1 : Dhcp 2 : Server 3 : 192.168.0.1 4 : Scope 5 : 192.168.0.10 6 : set 7 : optionvalue 8 : 6 9 : IPADDRESS 10 : 192.168.0.11 11 : 192.168.0.12 12 : 192.168.0.13 13 : 192.168.0.14 14 : 192.168.0.15 15 : 192.168.0.16 16 : 192.168.0.17 17 : 18 : 19 : 20 : </code></pre> <p><strong>What I would like to do is go through the csv file, check the value of columns 10-16 for each entry, and delete any entries that do not match a predefined list.</strong></p>
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