how to replace string using powershell

Question

I have the following string: $str = '"FirstName":"first name","LastName":"Last name","AskCatalog":false,"Nuteres":61","ZipCode":"1234"'

and I need to replace value of ,for example, FirstName:" first name " with a variable like this

"FirstName":"$strFristname"

Can anyone show me how can I do that in PowerShell?

Thank you.

Answer 1

Like this:

$str -replace '("FirstName":)".*?"', "`$1`"$strFirstname`""

The pattern ("FirstName":)".*?" matches the string "FirstName": followed by a double quote and the shortest match of any character ( .*? ) up to the next double quote. The parentheses create a group that can be referenced by $1 in the replacement string. Due to the double quotes around the replacement string that reference must be escaped ( `$1 ). The same goes for the nested double quotes ( `" ).

If you want the variable instead of its value to show up in the result, you need to escape the $ of the variable as well:

$str -replace '("FirstName":)".*?"', "`$1`"`$strFirstname`""

Demonstration:

PS C:\> 
PS C:\> 
PS C:\> 
"FirstName":"Joe","LastName":"Last name"
PS C:\> 
"FirstName":"$strFirstname","LastName":"Last name"

Answer 2

为什么不保持简单？

$str -replace 'First Name', $strFirstname