Use a variable into a JScode SetVariable Block

I need a expert help with what I need

On this text example :
Informações adicionais:\n\nCPF: 11122233344\nCelular / WhatsAppp : +5565992560189

I need extract the CPF number, in this case 11122233344 and set this as a variable to use, but this just work if I but manualy the text inside de jscode, using a variable give error
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