I don't know where you got that regex from, but it's certainly not from japhy's code. The regex his code produces is:
(?-xism:^[^pcd]*(?:(?:p(?!ig)|c(?!at)|d(?!og))[^p c d]*)*$)
(That's also the regex you used in your earlier response.)
The regex you used in your latest response has a parenthesis in the wrong place and is missing a quantifier; of couse it doesn't work!
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