There isn't another function to generate characters randomly. Sorry if I didn't make it clear but the Title I pass into this function could be something like:

Facto Delafé y las Flores Azules

and needs the é replacing so the final output should be:

Facto_Delafe_y_las_Flores_Azules

but instead I get:

Facto_DelafA_y_las_Flores_Azules