human
Solve the following python programming problem given the following code:
def rename_register(llvmir) : 
    "
    HLC does not like variable with '.' prefix.
    " 
    def repl(mat) : 
        return '%_dot_.{0}'.format (mat.group (1)) 
return re_regname.sub (repl, repl) 

    
    

    Fix the buggy line: return re_regname.sub (repl, repl)
assistant
#Here is Python program to fix the buggy line: return re_regname.

return re_regname.sub (repl, llvmir)