In PowerShell not able to locate and Replace String, This String is like a path with '%'-CodePudding

I am trying to Update Logo in the Htm Files we have two Path need to be replaced

Following one is working fine and getting Replaced.

Raw String

<img src=C:\ProductName\ProductNameClient\webapps\ProductNameClient\assets\img\logo\logo.jpg alt='ProductName Logo'>

Update due to Escape Sequence issue , we are using following String in Powershell to search for Raw string

<img src=C:\\ProductName\\ProductNameClient\\webapps\\ProductNameClient\\assets\\img\\logo\\logo.jpg alt='ProductName Logo'>

Replace String

<img src=../../ProductNameNew/ProductNameNewLogo.png alt='ProductNameNew Logo'>

PowerShell Script working fine for this String

 Get-ChildItem -Path (Get-Item .).FullName -Recurse -File *.htm | ForEach-Object {
 $content = Get-Content -Path $_.FullName
  if($content -match "<img src=C:\\ProductName\\ProductNameClient\\webapps\\ProductNameClient\\assets\\img\\logo\\logo.jpg alt='ProductName Logo'>"){
     $content -replace "<img src=C:\\ProductName\\ProductNameClient\\webapps\\ProductNameClient\\assets\\img\\logo\\logo.jpg alt='ProductName Logo'>","<img src=../../ProductNameNew/ProductNameNewLogo.png alt='ProductNameNew Logo'>" | Set-Content -Path $_.FullName
  }}

I used the same powershell script and Update the String for escape sequence

Not working with this String Raw string

<img src=C:\Program Files (x86)\ProductName\.\ProductNameConfigs\ProductNameOLDlogo.png alt='ProductName Logo'>

Update due Escape Sequence issue

<img src=C:\\Program Files (x86)\\ProductName\\.\\ProductNameConfigs\\ProductNameOLDlogo.png alt='ProductName Logo'>

Replace String

<img src=../../../ProductNameNew/ProductNameNewLogo.png alt='ProductNameNew Logo'>

i used the escape sequence that worked for previous Update but now its not working i am not getting any error to resolve this in powershell, Script will execute, string will remain unchanged and no error in powershell

Get-ChildItem -Path (Get-Item .).FullName -Recurse -File *.htm | ForEach-Object {
 $content = Get-Content -Path $_.FullName
  if($content -match "<img src=C:\\Program Files (x86)\\ProductName\\.\\ProductNameConfigs\\ProductNameOLDlogo.png alt='ProductName Logo'>"){
     $content -replace "<img src=C:\\Program Files (x86)\\ProductName\\.\\ProductNameConfigs\\ProductNameOLDlogo.png alt='ProductName Logo'>","<img src=../../../ProductNameNew/ProductNameNewLogo.png alt='ProductNameNew Logo'>" | Set-Content -Path $_.FullName
  }}

as i ran and check its not getting updated can someone please Provide me some inputs

CodePudding user response：

There are more characters, like the parenthesis and dots to escape than just the backslash. For your "raw string" to be used as a literal pattern in your -match Regular Expression, this means:

[Regex]::Escape("<img src=C:\Program Files (x86)\ProductName\.\ProductNameConfigs\ProductNameOLDlogo.png alt='ProductName Logo'>")
<img\ src=C:\\Program Files \(x86\)\\ProductName\\\.\\ProductNameConfigs\\ProductNameOLDlogo\.png\ alt='ProductName\ Logo'>

Thus:

...
$Pattern = [Regex]::Escape("<img src=C:\Program Files (x86)\ProductName\.\ProductNameConfigs\ProductNameOLDlogo.png alt='ProductName Logo'>")
if ($content -match $Pattern) { ...

Anyways, it is generally a bad idea to attempt to parse HTML with regular expressions.
Instead you might consider a dedicated HTML parser as the HtmlDocument class:

$Html = @'
    <!DOCTYPE html>
    <html>
    <body>
    
    <h2>HTML Images</h2>
    <p>HTML images are defined with the img tag:</p>
    
    <img src=C:\Program Files (x86)\ProductName\.\ProductNameConfigs\ProductNameOLDlogo.png alt='ProductName Logo'>
    
    </body>
    </html>
'@

function ParseHtml($String) {
    $Unicode = [System.Text.Encoding]::Unicode.GetBytes($String)
    $Html = New-Object -Com 'HTMLFile'
    if ($Html.PSObject.Methods.Name -Contains 'IHTMLDocument2_Write') {
        $Html.IHTMLDocument2_Write($Unicode)
    } 
    else {
        $Html.write($Unicode)
    }
    $Html.Close()
    $Html
}

$Document = ParseHtml $Html
$Document.getElementsByTagName('img') |ForEach-Object {
    if (  $_.nameProp -eq 'ProductNameOLDlogo.png' ) {
        $_.src = [uri]::EscapeDataString('../../../ProductNameNew/ProductNameNewLogo.png')
        $_.alt = 'ProductNameNew Logo'
    }
}

@"
<!DOCTYPE html>
<html>
$($Document.body.outerHtml)
</html>
"@