Filtering the log using REGEX

I have logs which contains 'LogonType=Owner' and some logs which contains 'InternalLogonType=Owner'. I want to send 'LogonType=Owner' to nullqueue while the latter not, so how can i write regex for it? As writing regex for 'LogonType=Owner' would also capture 'InternalLogonType=Owner' and send it to nullqueue i assume. Note: logs are big 'LogonType=Owner' & 'InternalLogonType=Owner' are just one string in it.