Cut off text in string after before separator in powershell

Question

Ok so here is what I m trying to do  I want to make a little powershell script that takes each file of my music library and then does a hash sum of it and writes that into a file like so   test txt   131 136 80 89 119 17 60 123 210 121 188 42 136 200 131 198   Now when I start the script I need it to first compare my music library with the already existing values but for this I just want to cut off everything after the   so that it can compare filename against filename  or filepath     but I m stumped at  how to do that  tried replacing with   name    name -replace           no go     tried to filter    don t know how D   I d really appreciate help   Also if you think I m using the wrong coding language  tell me and what would be better  it s just I only ever used C and powershell

User · Accepted Answer

pos    name IndexOf       leftPart    name Substring 0   pos   rightPart    name Substring  pos 1    Internally  PowerShell uses the String class

User · Answer

Using regex  the result is in  matches 1     str    test txt   131 136 80 89 119 17 60 123 210 121 188 42 136 200 131 198   str -match         s     matches 1  test txt

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I had a dir full of files including some that were named invoice no-product no pdf and wanted to sort these by product no  so     get-childitem   pdf   sort-object -property   expression      name substring     name indexof  -   1      Note that in the absence of a - this sorts by    name

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This does work for a specific delimiter for a specific amount of characters between the delimiter  I had many issues attempting to use this in a for each loop where the position changed but the delimiter was the same  For example I was using the backslash as the delimiter and wanted to only use everything to the right of the backslash  The issue was that once the position was defined  71 characters from the beginning  it would use  pos as 71 every time regardless of where the delimiter actually was in the script  I found another method of using a delimiter and  split to break things up then used the split variable to call the sections For instance the first section was  variable 0  and the second section was  variable 1

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name -replace           You were close  but you used the syntax of a wildcard expresson rather than a regular expression  which is what the -replace operator expects   Therefore  hash sequence shortened    PS gt   test txt   131 136 80 89 119 17 60 123 210 121 188  -replace   s      test txt   Note    Omitting the substitution-text operand  the 2nd RHS operand  implicitly uses     the empty string   i e  it effectively removes what the regex matched     is what represents a potentially empty run     of characters     in a regex - it is the regex equivalent of   by itself in a wildcard expression  Adding  s  before the   in the regex also removes trailing whitespace   s  after the filename  I ve used       rather than       to enclose the regex  so as to prevent confusion between what PowerShell expands up front  see expandable strings in PowerShell and what the  NET regex engine sees

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text    test txt   131 136 80 89 119 17 60 123 210 121 188 42 136 200 131 198    text split      1  split

User · Answer

You can use a Split     text    test txt   131 136 80 89 119 17 60 123 210 121 188 42 136 200 131 198   separator         you can put many separator like this           parts    text split  separator   echo  parts 0    return test txt echo  parts 1    return the part after the separator

[string] Cut off text in string after/before separator in powershell

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