Hide keyboard on tap, more robust search algorithm, option to search by dictionary word or definition

Toki Trainer/ViewModels/TokiDictionaryViewModel.swift

@@ -52,11 +52,21 @@ class TokiDictionaryViewModel: ObservableObject {
                 entryMatch = true
             }
             
-            // Check if any part of the word definitions match in English, even partially
+            // Check if any part of the word definitions match in English, even partially, but
+            // only by prefix (if one of the definition words matches the beginning of the word with
+            // the search term)
             for definition in value.definitions {
-                if definition.definition.contains(input) {
-                    entryMatch = true
+                let capturePattern = #"(\w+)"#
+                let captures = self.searchStringForRegex(string: definition.definition, regex: capturePattern)
+                for capture in captures {
+                    if capture.hasPrefix(input) {
+                        entryMatch = true
+                    }
                 }
+                // Commented out, less strict matching that will match on any substring match
+//                if definition.definition.contains(input) {
+//                    entryMatch = true
+//                }
             }
             
             // Add to dictionary