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 caffeate (MCA), but not sinapate (MSA) (PubMed:15006424). feruloyl-polysaccharide + H2O = ferulate + polysaccharide. Belongs to the carbohydrate esterase 1 (CE1) family. Feruloyl esterase type B subfamily.