diff --git a/Sources/JSONSchema.swift b/Sources/JSONSchema.swift
index c4d5c81..b00bdad 100644
--- a/Sources/JSONSchema.swift
+++ b/Sources/JSONSchema.swift
@@ -61,6 +61,7 @@ public struct Schema {
     formats = [
       "ipv4": validateIPv4,
       "ipv6": validateIPv6,
+      "uri": validateURI,
     ]
   }
 
diff --git a/Sources/Validators.swift b/Sources/Validators.swift
index 6b7d55f..6ae6dc7 100644
--- a/Sources/Validators.swift
+++ b/Sources/Validators.swift
@@ -423,3 +423,23 @@ func validateIPv6(_ value:Any) -> ValidationResult {
 
   return .Valid
 }
+
+func validateURI(_ value:Any) -> ValidationResult {
+  if let uri = value as? String {
+    // Using the regex from http://blog.dieweltistgarnichtso.net/constructing-a-regular-expression-that-matches-uris
+    
+    if let expression = try? NSRegularExpression(pattern: "((?<=\\()[A-Za-z][A-Za-z0-9\\+\\.\\-]*:([A-Za-z0-9\\.\\-_~:/\\?#\\[\\]@!\\$&'\\(\\)\\*\\+,;=]|%[A-Fa-f0-9]{2})+(?=\\)))|([A-Za-z][A-Za-z0-9\\+\\.\\-]*:([A-Za-z0-9\\.\\-_~:/\\?#\\[\\]@!\\$&'\\(\\)\\*\\+,;=]|%[A-Fa-f0-9]{2})+)", options: NSRegularExpression.Options(rawValue: 0)) {  
+      let result = expression.matches(in: uri, options: NSRegularExpression.MatchingOptions(rawValue: 0), range: NSMakeRange(0, uri.characters.count))
+      if result.count == 1 {
+        let foundRange = result[0].range
+        if foundRange.location == 0 && foundRange.length == uri.characters.count {
+          return .Valid
+        }
+      }
+    }
+    
+    return .invalid(["'\(uri)' is not a valid URI."])
+  }
+  
+  return .Valid
+}