PowerShell: remove or replace quote marks from variable

Question

I\'m using Get-EventLog to set a variable, and then setting another variable with the event ID description. I then use blat.exe to email this information to a group.

Th

Answer 1

The problem is that a simple replace cleans out every quote character, even if escaped (doubled). Here are the functions I created for my use :

• one which removes only orphan quotes.
• one which escapes them

I also made them generic to manage other characters, with the optional $charToReplace parameter

#Replaces single occurrences of characters in a string.
#Default is to replace single quotes
Function RemoveNonEscapedChar {
    param(
        [Parameter(Mandatory = $true)][String] $param,
        [Parameter(Mandatory = $false)][String] $charToReplace
    )

    if ($charToReplace -eq '') {
        $charToReplace = "'"
    }
    $cleanedString = ""
    $index = 0
    $length = $param.length
    for ($index = 0; $index -lt $length; $index++) {
        $char = $param[$index]
        if ($char -eq $charToReplace) {
            if ($index +1 -lt $length -and $param[$index + 1] -eq $charToReplace) {
                $cleanedString += "$charToReplace$charToReplace"
                ++$index ## /!\ Manual increment of our loop counter to skip next char /!\
            }
            continue
        }
        $cleanedString += $char
    }
    return $cleanedString
}
#A few test cases : 
RemoveNonEscapedChar("'st''r'''i''ng'")                               #Echoes st''r''i''ng
RemoveNonEscapedChar("""st""""r""""""i""""ng""") -charToReplace '"'   #Echoes st""r""i""ng
RemoveNonEscapedChar("'st''r'''i''ng'") -charToReplace 'r'            #Echoes 'st'''''i''ng'

#Escapes single occurences of characters in a string.  Double occurences are not escaped.  e.g.  ''' will become '''', NOT ''''''.
#Default is to replace single quotes
Function EscapeChar {
    param(
        [Parameter(Mandatory = $true)][String] $param,
        [Parameter(Mandatory = $false)][String] $charToEscape
    )
    
    if ($charToEscape -eq '') {
        $charToEscape = "'"
    }
    $cleanedString = ""
    $index = 0
    $length = $param.length
    for ($index = 0; $index -lt $length; $index++) {
        $char = $param[$index]
        if ($char -eq $charToEscape) {
            if ($index +1 -lt $length -and $param[$index + 1] -eq $charToEscape) {
                ++$index ## /!\ Manual increment of our loop counter to skip next char /!\
            }
            $cleanedString += "$charToEscape$charToEscape"
            continue
        }
        $cleanedString += $char
    }
    return $cleanedString
}
#A few test cases : 
EscapeChar("'st''r'''i''ng'")                              #Echoes ''st''r''''i''ng''
EscapeChar("""st""""r""""""i""""ng""") -charToEscape '"'   #Echoes ""st""r""""i""ng""
EscapeChar("'st''r'''i''ng'") -charToEscape 'r'            #Echoes 'st''rr'''i''ng'