PowerShell CheatSheet – Working with strings

Like in previous “educationnal” post, I consider that theory is bullshit; only an example is valuable!
So here’s a few examples to illustrate what we can do with strings.

  1. Comparison
  2. $string1="I am a string"
    $string2="I'm a string"
    $result=$string1.CompareTo($string2)
    
    if ($result -eq 0) {
    Write-Host "The 2 compared strings are equal"
    } elseif ($result -eq 1) {
    Write-Host "`"$string1`" is less than `"$string2`""
    }
    elseif ($result -eq -1) {
    Write-Host "`"$string1`" is greater than `"$string2`""
    }
    else {Write-Host "Couldn't compare `"$string1`" and `"$string2`""}
    
  3. Lower/Upper case
  4. $string1="I am a string becoming... sorry, became upper"
    $string2="I AM A STRING BECOMING... SORRY, BECAME LOWER"
    $string1.ToUpper()
    $string2.ToLower()
    
  5. Starts/Ends With
  6. $string1="I am a string. Do I start with a `"S`" like `"String`"?"
    $result=$string1.StartsWith('S')
    if (!$result) {Write-Host "Of course not! My content is checked, not my name..."} else {Write-Host "PowerShell has probably some issues with spelling today!"}
    
    $string2="I am a string. Do I end with a `"g`" like in the end of the word `"String`"?"
    $result=$string2.EndsWith('g')
    if (!$result) {Write-Host "Of course not! My content is checked, not my name..."} else {Write-Host "PowerShell has probably some issues with spelling today!"}
    
  7. Playing with letters
    • Contains
    • $string1="I am a string. Do I contain the letter `"s`" like `"string`"?"
      $result=$string1.Contains('s')
      if ($result) {
      Write-Host "Yes! But how many times?"
      $occurrences=[regex]::matches($string1,"s").count
      Write-Host "The letter `"s`" is contains $occurrences times"
      } else {"Nope!"}
      Write-Host "Ok, but how many letters (total) do I have?"
      $result=$string1.length
      Write-Host "$result letter(s)"
      
    • Where’s My (Water) Letter?
    • $string1="I am a string. Ok, we knew it... But can I know where's my FIRST `"s`"?"
      $firsts=$string1.IndexOf('s')
      $firsts+=1 #Yes, we have to add 1 because the first position begins at '0'
      Write-Host "Of course we can! Your FIRST `"s`" is the ${firsts}th letter in the string"
      Write-Host "And what about the LAST `"s`"?"
      $lasts=$string1.LastIndexOf('s')
      $lasts+=1 #Yes, we have to add 1 because the first position begins at '0'
      Write-Host "Come on! Your LAST `"s`" is the ${lasts}th letter in the string"
      
    • Adding or remove a letter
    • $string1="I am a funny string"
      $comment="and as I am a Police fan, now I would like to be a..."
      $positions=$string1.IndexOf("r")
      $leftPartofString=$string1.Substring(0, $positions)
      $rightPartofString=$string1.Substring($positions+1)
      $string2="$leftPartofString" + "$rightPartofString"
      $string2=$string2.Substring(4)
      Write-Host "$string1 $comment"
      Write-Host "$string2!"
      $string2=$string2.Substring(9)
      $string2=$string2.Insert(2, "R")
      Write-Host "OK, I'm still a simple $string2..."
      
    • Replace a letter (or more)
    • $string1="string"
      Write-Host "I don't want to be a $string1 anymore... Please do something!"
      $string2=$string1.Replace('string', 'integer')
      Write-Host "Now we can say I'm an ${string2}. Even if it's not my real type..."
      
  8. Join/Split
  9. $string1="I am a string."
    $string2="I'm your wife!"
    $result=$string1 + " " + $string2
    Write-Host "$result"
    
    Write-Host "And we can get divorced!"
    $result.split(".")
    
  10. (Durable) Split
  11. $string="I want to be independant! Me too..."
    $splitedstring=$string.split("!")
    $string1=$splitedstring[0]
    $string2=$splitedstring[1]
    Write-Host "Content of separated `"`$string1`" is: $string1"
    Write-Host "Content of separated `"`$string2`" is: $string2"
    
  12. Bonus Tip
  13. Write-Host "We can imagine a string containing a number. If we don't need to calculate something with it..."
    Write-Host "We can also imagine this string is hum... my salary!"
    Write-Host "Of course, it's an example so I want to be rich!"
    Write-Host "So my salary will be contains in `"`$Salary`"."
    Write-Host "And its value will be 200K€/year. So let's affect `"200`" to `"`$Salary`"."
    $Salary="200"
    $BadResult="My Salary is $SalaryK€/year"
    Write-Host "$BadResult"
    Write-Host "Not good at all..."
    $BadResult="My Salary is $Salary K€/year"
    Write-Host "$BadResult"
    Write-Host "Better? Yes, because we now have the value, but what I need is to get rid of this space..."
    Write-Host "This one is fine: My Salary is ${Salary}K€/year"
    

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