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    <p>Here is a "Longest Common Substring" function for two strings in PowerShell (based on wikibooks <a href="http://en.wikibooks.org/wiki/Algorithm_Implementation/Strings/Longest_common_substring#C.23" rel="nofollow">C# example</a>):</p> <pre><code>Function get-LongestCommonSubstring { Param( [string]$String1, [string]$String2 ) if((!$String1) -or (!$String2)){Break} # .Net Two dimensional Array: $Num = New-Object 'object[,]' $String1.Length, $String2.Length [int]$maxlen = 0 [int]$lastSubsBegin = 0 $sequenceBuilder = New-Object -TypeName "System.Text.StringBuilder" for ([int]$i = 0; $i -lt $String1.Length; $i++) { for ([int]$j = 0; $j -lt $String2.Length; $j++) { if ($String1[$i] -ne $String2[$j]) { $Num[$i, $j] = 0 }else{ if (($i -eq 0) -or ($j -eq 0)) { $Num[$i, $j] = 1 }else{ $Num[$i, $j] = 1 + $Num[($i - 1), ($j - 1)] } if ($Num[$i, $j] -gt $maxlen) { $maxlen = $Num[$i, $j] [int]$thisSubsBegin = $i - $Num[$i, $j] + 1 if($lastSubsBegin -eq $thisSubsBegin) {#if the current LCS is the same as the last time this block ran [void]$sequenceBuilder.Append($String1[$i]); }else{ #this block resets the string builder if a different LCS is found $lastSubsBegin = $thisSubsBegin $sequenceBuilder.Length = 0 #clear it [void]$sequenceBuilder.Append($String1.Substring($lastSubsBegin, (($i + 1) - $lastSubsBegin))) } } } } } return $sequenceBuilder.ToString() } </code></pre> <p><strong>To use this for more than two strings, use it like this:</strong></p> <pre><code>Function get-LongestCommonSubstringArray { Param( [Parameter(Position=0, Mandatory=$True)][Array]$Array ) $PreviousSubString = $Null $LongestCommonSubstring = $Null foreach($SubString in $Array) { if($LongestCommonSubstring) { $LongestCommonSubstring = get-LongestCommonSubstring $SubString $LongestCommonSubstring write-verbose "Consequtive diff: $LongestCommonSubstring" }else{ if($PreviousSubString) { $LongestCommonSubstring = get-LongestCommonSubstring $SubString $PreviousSubString write-verbose "first one diff: $LongestCommonSubstring" }else{ $PreviousSubString = $SubString write-verbose "No PreviousSubstring yet, setting it to: $PreviousSubString" } } } Return $LongestCommonSubstring } get-LongestCommonSubstringArray $Arr -verbose </code></pre>
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    1. POLongest common substring for more than two strings in PowerShell?
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    1. PTAnswer
    1. USWinfred
    1. USWinfred
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    1. COShould be able to run it multiple times, combining the results. Unless I just haven't gotten enough sleep, longest common substring should be transitive, so something like this should work: LCS(LCS(LCS(1 2) 3) 4).
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      1. USDaniel Richnak
    2. COAh yes, of course. Updating my answer.
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      1. USWinfred
    3. COI don't think that LCS is transitive. Consider these strings: "some big string", "some other big string", "some thing". If you did LCS(3, LCS(1, 2)) then you would get "ing" instead of "some "
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      1. USTom H
 

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