[1.7.10][1.8.9] Regex for a well formed block name?

[OreCruncher]

I was wondering if there is a regex for a block name returned from the block registry.  Based on my fairly simple investigation it seems the name is rather open ended.  Only specific thing I noticed is that the string is comprised of two tokens pasted together with a ":"(the mod ID and the name of the block within the mod).

 

If there is a regex buried within Minecraft/Forge I could use, great!  Otherwise, does someone have an expression they use that has been working?

 

Thanks!

[OreCruncher]

Thanks a bunch!