PowerShell - Replace a specific string in xml file-CodePudding

I have xml file that contains version number. I know how to replace a string in a file but here I need to find something that start with 8 and replace it with a number. For an example

There are many places where the version 8.5.34.31.4 is displayed (There more many more and not all of them starts with <version...) I need to search something like 8 plus and replace it with another number like 8.5.34.31.5 For every xml the version is different (8.5.34, 8.6.22,...) So I thought to search the common beginning that is 8 Any idea how to do this?

CodePudding user response：

You can locate all nodes with string contents starting with 8. by using the following XPath expression:

//*[starts-with(text(), "8.")]

//* describes "any node, at any place" in the document, [starts-with(text(), "8.")] constrains the resulting set of nodes to only those where the embedded string content starts with "8.".

To use it to locate specific xml nodes to replace, I'd suggest using the Select-Xml cmdlet:

# define the new version number
$newVersion = '8.5.34.31.5'

# locate document on disk
$xmlFile = Get-Item .\path\to\document.xml

# use Select-Xml to read, parse, and query document for relevant nodes
$targetNodes = $xmlFile |Select-Xml -XPath '//*[starts-with(text(), "8.")]' 

if($targetNodes){
    $targetNodes |ForEach-Object {
        # replace the string contents of the node with the new version number
        $_.Node.InnerText = $newVersion
    }

    # save to disk after modifying
    $targetNodes[0].Node.OwnerDocument.Save($xmlFile.FullName)
}