regular expression question

Sorry, this is probably silly question, but I cannot find right
answer.

I am trying to use grep -P (for perl regular expressions). I want to
match lines that do not contain the chars "sync".

I thought I could do:

grep -P "[^(sync)]" mytextfile

I understand [] matches any char in the brackets and (sync) groups
those chars together, so I would negate to mean should not match those
chars.

This is return all lines in the file. I am doing something wrong, just
do not know what. Can someone explain, please?
.

Relevant Pages

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