This is one way to print 10 (or more) consecutive "goku" in a line: 
while (<DATA>) {
    print if /(?:goku){10}/i;
}

__DATA__
1 gokugokugokugokugokugokugokugokugokugoku
2 gokugokugokugokugokugoku
foo

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In reply to Re: Matching a regex in a line by toolic
in thread Matching a regex in a line by The_Last_Monk

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