PowerShell内容替换和转义双引号

Question

Need to replace string name = null with string name = "Jane Doe"; trying to use below code - no success.

I do not want to save it in parameters and change because of I have to keep doing multiple times in 3rd party application

(Get-Content -Path %testPath%) -replace 'string name = null', 'string name = \`"Jane Doe\`"' |
    Set-Content %testPath%

Answer 1

Your whole approach/(original) script line only makes sense to me
when invoked out of a batch file/other higher level management.

Then escaping on multiple levels is always a difficult thing.

As the script line itself is in double quotes,
the inner double quotes have to be escaped from the executing cmd.exe with a backslash.

:: Q:\Test\2019\08\23\SO_57618950.cmd
@Echo off
set "testPath=Q:\Test\2019\08\23\foo.txt"
powershell -NoP -C "(Get-Content -Path '%testPath%') -replace 'string name = null', 'string name = \"Jane Doe\"'|Set-Content -Path '%testPath%"'

type "%testPath%"

Sample run:

> Q:\Test\2019\08\23\SO_57618950.cmd   
# This is foo.txt
string name = "Jane Doe"

# end of text