Tried to find /r/DevelEire using the search terms "Irish Software Developers" No luck but Google will bring it up as a first result if the query is "Irish Software Developers Reddit".
I find your example to be the biggest "no-go" for any practical application because the info/description of that /r/DevelEire is literally "A sub reddit for Irish Software Developers". That's something that a simple FULLTEXT solution would have easily found w/high confidence.