Spigot plugin to allow hoppers to filter items given filter names.
Hopper Filters | SpigotMC

This plugin allows players to set filters on hoppers by naming them in an anvil, based on the plugin shown in LiveOverflow's recent video.

If the item's id matches the name of the hopper, the hopper will allow it to pass. If it does not match, the hopper will not accept the item. Additionally, the filters accept wildcards: * will match 0 or more of any character and ? will match exactly one of any character. Unlike in LiveOverflow's version, this one accepts wildcards anywhere in the filter and not just the beginning and end. Like LiveOverflow's, it accepts multiple filters separated by commas and will match any of the filters given.