Adding a wildcard symbol, like *, would be immensely helpful for massive undertakings. For example, I intend to make certain ores mineable only when using certain pickaxes using break events, but I'm using a mod called Terrafirmacraft that adds ores like so:
tfc:ore/garnierite/rockType1
tfc:ore/garnierite/rockType2
And so on for ~20 different types of stone. For garnierite alone I'd have to include each type of stone, then compare them against 4 types of pickaxes, meaning I'll need to define ~80 different rules (~20 for each of the 4 types of pickaxes that will be able to mine garnierite) just to define which pickaxes can and can't mine garnierite. This isn't even getting into all the variations of iron and other ores I'm going to define rules for. This is going to add up to several hundreds of rules I'll need to define manually.
With a wildcard I could cut down on a whopping 19/20ths of my workload by defining tfc:ore/garnierite/[asterisk goes here; github won't format this post properly if I place 2 asterisks in 1 post] once for each type of pickaxe that can mine garnierite, and the same goes for all other ores.