Using replace in powershell script not replacing

Question

Why replace is not working? Here is the code

$TestString = "<css>1</css><PredefinedValidator>9DE32F03C2734FFCB2D681FF6283FE88</PredefinedValidator><RegexPattern>^[\da-zA-Z\s+()\-']+$</RegexPattern><item>2</item>"
$NewString =  $TestString  -replace "<PredefinedValidator>9DE32F03C2734FFCB2D681FF6283FE88</PredefinedValidator><RegexPattern>^[\da-zA-Z\s+()\-']+$</RegexPattern>","<PredefinedValidator>9DE32F03C2734FFCB2D681FF6283FE88</PredefinedValidator><RegexPattern>^[0-9]+$</RegexPattern>"
write-host  $NewString

Is there something I am doing wrong?

Any suggestions would be appreciated.

Thanks in advance

If this is about making changes in an XML file, you shouldnýt use textual replace methods. There are many examples on how to do this, but if you show us the xml we can help you with that. — Theo
– Theo, Commented Mar 11, 2021 at 13:39

Rob · Accepted Answer · 2021-03-11 04:06:42Z

1

The replace operator will replace a string matching a regex pattern. From the looks of it, you are attempting to replace a literal string with another literal string and both of them happen to also have a regex pattern in them. Use the Replace method instead

$TestString = "<css>1</css><PredefinedValidator>9DE32F03C2734FFCB2D681FF6283FE88</PredefinedValidator><RegexPattern>^[\da-zA-Z\s+()\-']+$</RegexPattern><item>2</item>"
$NewString =  $TestString.Replace("<PredefinedValidator>9DE32F03C2734FFCB2D681FF6283FE88</PredefinedValidator><RegexPattern>^[\da-zA-Z\s+()\-']+$</RegexPattern>","<PredefinedValidator>9DE32F03C2734FFCB2D681FF6283FE88</PredefinedValidator><RegexPattern>^[0-9]+$</RegexPattern>")
write-host  $NewString

answered Mar 11, 2021 at 4:06

Rob

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