Regex for finding nonterminal simps?

Stream: general

[Moritz Doll]

I found a few nonterminal simps in analysis/special_functions/pow and now I want to go through the whole file. Does have (or is able to write) a regex that finds simp, but not the attribute [simp] or simp only?

[Moritz Doll]

(?!\[)(simp)(?!_)(?!\])(?!\sonly) this seems to work in case anyone is interested