That's one ugly regex which is too long for a single line like it
should be:

froxlor\.WARNING: Unknown user tried to login\.
{"source":"login","action":"50","user":"<HOST>"\} \[\]

...but it matches here. I only escaped special characters for Perl,
i.e. these ones: . ( ) [ ] { } by putting a \ directly before them.
Feel free to modify to your needs. 
Cheers,

        tim


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