formulas – Google Sheets for if contains “*”

I have found the the regexmatch solution for substring: Google Sheets formula for “if contains”

However, why for “” is not working? I’m trying to make a condition if the name contains “” it will exclude the stamp duty cost.

As for now, I’m using =IF(REGEXMATCH(C11,”-“),0,ROUNDUP(G11/1000,0)). What is the explanation why “*” cannot be used?

Thank you