.NET Fiddle

VbNet · Console

/Program.vb

Imports System

Public Module Module1

	Public Sub Main()
		dim str as string = """{""""messages"""":[{""""messageId"""":""""245043"""",""""campaignId"""":""""14085"""""
		console.WriteLine("Input : " & str)
		str = str.replace("""", "'").Replace("''", """").Replace("'", """")
		console.WriteLine("Output : " & str)
	End Sub
End Module
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