bench: re2: no longer print out the user regex.
bench: re2: no longer print out the user regex.

openresty/sregex,MarginC/sregex,openresty/sregex,openresty/sregex,MarginC/sregex,MarginC/sregex,openresty/sregex,MarginC/sregex,MarginC/sregex