gistfile1.json

[
   {
      "poolName":"50BTC",
      "url":"https://50btc.com/",
      "searchStrings":[
         "50BTC.com",
         "50btc.com"
      ]
   },
   {
      "poolName":"175btc",
      "url":"http://www.175btc.com/",
      "searchStrings":[
         "Mined By 175btc.com"
      ]
   },
   {
      "poolName":"ASICminer",
      "url":"https://bitcointalk.org/index.php?topic=99497.0",
      "searchStrings":[
         "Mined By ASICMiner"
      ]
   },
   {
      "poolName":"BitMinter",
      "url":"https://bitminter.com/",
      "searchStrings":[
         "BitMinter"
      ]
   },
   {
      "poolName":"Bitparking",
      "url":"http://bitparking.com/",
      "searchStrings":[
         "bitparking"
      ]
   },
   {
      "poolName":"BTC Guild",
      "url":"https://www.btcguild.com/",
      "searchStrings":[
         "Mined by BTC Guild",
         "BTC Guild"
      ]
   },
   {
      "poolName":"Discus Fish",
      "url":"http://f2pool.com/",
      "searchStrings":[
         "七彩神仙鱼",
         "Made in China",
         "Mined by user"
      ]
   },
   {
      "poolName":"Discus Fish Solo",
      "url":"http://f2pool.com/",
      "searchStrings":[
         "For Pierce and Paul"
      ]
   },
   {
      "poolName":"Eligius",
      "url":"http://eligius.st/",
      "searchStrings":[
         "Eligius"
      ]
   },
   {
      "poolName":"EclipseMC",
      "url":"https://eclipsemc.com/",
      "searchStrings":[
         "Josh Zerlan was here!",
         "EclipseMC",
         "Aluminum Falcons"
      ]
   },
   {
      "poolName":"GIVE-ME-COINS",
      "url":"https://give-me-coins.com/",
      "searchStrings":[
         "Mined at GIVE-ME-COINS.com"
      ]
   },
   {
      "poolName":"ghash.io",
      "url":"https://ghash.io/",
      "searchStrings":[
         "ghash.io",
         "GHash.IO"
      ]
   },
   {
      "poolName":"Horrible Horrendous Terrible Tremendous",
      "url":"http://hhtt.1209k.com/",
      "searchStrings":[
         "HHTT"
      ]
   },
   {
      "poolName":"Megabigpower",
      "url":"http://megabigpower.com/",
      "searchStrings":[
         "megabigpower.com"
      ]
   },
   {
      "poolName":"Mt Red",
      "url":"https://mtred.com/‎",
      "searchStrings":[
         "/mtred/"
      ]
   },
   {
      "poolName":"MaxBTC",
      "url":"https://www.maxbtc.com",
      "searchStrings":[
         "MaxBTC"
      ]
   },
   {
      "poolName":"NMCbit",
      "url":"http://nmcbit.com/",
      "searchStrings":[
         "nmcbit.com"
      ]
   },
   {
      "poolName":"ozcoin",
      "url":"https://ozco.in/",
      "searchStrings":[
         "ozco.in",
         "ozcoin"
      ]
   },
   {
      "poolName":"Polmine.pl",
      "url":"https://polmine.pl/‎",
      "searchStrings":[
         "by polmine.pl"
      ]
   },
   {
      "poolName":"simplecoin",
      "url":"http://simplecoin.us/",
      "searchStrings":[
         "simplecoin.us ftw"
      ]
   },
   {
      "poolName":"Slush",
      "url":"https://mining.bitcoin.cz/",
      "searchStrings":[
         "slush"
      ]
   },
   {
      "poolName":"TripleMining",
      "url":"https://www.triplemining.com/",
      "searchStrings":[
         "Triplemining.com"
      ]
   },
   {
      "poolName":"wizkid057",
      "url":"http://wizkid057.com/btc",
      "searchStrings":[
         "wizkid057"
      ]
   },
   {
      "poolName":"Yourbtc.net",
      "url":"http://yourbtc.net/",
      "searchStrings":[
         "yourbtc.net"
      ]
   }
]

The 50BTC strings seem redundant.

I suggest not matching strings less than at least 4 characters long, since it can very easily appear in other data by chance.

Both good points, thank you. I've updated the EMC one to a longer string that certainly only appears on their blocks. Only two false positives with that one oddly enough.