Involved in degradation of plant cell walls. Hydrolyzes the feruloyl-arabinose ester bond in arabinoxylans as well as the feruloyl-galactose and feruloyl-arabinose ester bonds in pectin (By similarity). Active against methyl esters of sinapate (MSA) and caffeate (MCA) (PubMed:15006424). feruloyl-polysaccharide + H2O = ferulate + polysaccharide. Belongs to the tannase family.