diff --git a/TemplateGenerator/Extensions/EnumerableExtensions.cs b/TemplateGenerator/Extensions/EnumerableExtensions.cs
index dd1be6df3..fd22050f1 100644
--- a/TemplateGenerator/Extensions/EnumerableExtensions.cs
+++ b/TemplateGenerator/Extensions/EnumerableExtensions.cs
@@ -34,4 +34,13 @@ public static Dictionary<string, string> ToStringDictionary<TEnum>(this IEnumera
 
         return source.ToDictionary(static element => element.ToShortName(), static element => element.ToString());
     }
+
+    public static Dictionary<string, TValue> ToPatternKeyedDictionary<TKey, TValue>(
+        this IEnumerable<(TKey Key, TValue Value)> source)
+        where TKey : struct, Enum
+    {
+        Guard.IsNotNull(source);
+
+        return source.ToDictionary(static pair => pair.Key.ToPattern(), static pair => pair.Value);
+    }
 }
diff --git a/TemplateGenerator/Models/Definitions.cs b/TemplateGenerator/Models/Definitions.cs
index 338cc2501..0909d4201 100644
--- a/TemplateGenerator/Models/Definitions.cs
+++ b/TemplateGenerator/Models/Definitions.cs
@@ -61,5 +61,5 @@ public class Definitions
     {
         (GameMode.Story,         "ゲーム本編"),
         (GameMode.SpellPractice, "スペルプラクティス"),
-    }.ToStringKeyedDictionary();
+    }.ToPatternKeyedDictionary();
 }
diff --git a/TemplateGenerator/Models/Th15/Definitions.cs b/TemplateGenerator/Models/Th15/Definitions.cs
index 606056989..2ccaae840 100644
--- a/TemplateGenerator/Models/Th15/Definitions.cs
+++ b/TemplateGenerator/Models/Th15/Definitions.cs
@@ -50,5 +50,5 @@ public class Definitions : Models.Definitions
     {
         (GameMode.Pointdevice, "完全無欠モード"),
         (GameMode.Legacy,      "レガシーモード"),
-    }.ToStringKeyedDictionary();
+    }.ToPatternKeyedDictionary();
 }
diff --git a/ThScoreFileConverter.Core/Models/GameMode.cs b/ThScoreFileConverter.Core/Models/GameMode.cs
index 54357bde0..45661f19f 100644
--- a/ThScoreFileConverter.Core/Models/GameMode.cs
+++ b/ThScoreFileConverter.Core/Models/GameMode.cs
@@ -15,12 +15,12 @@ public enum GameMode
     /// <summary>
     /// Story Mode.
     /// </summary>
-    [EnumAltName("S")]
+    [Pattern("S")]
     Story,
 
     /// <summary>
     /// Spell Practice Mode.
     /// </summary>
-    [EnumAltName("P")]
+    [Pattern("P")]
     SpellPractice,
 }
diff --git a/ThScoreFileConverter.Core/Models/Th15/GameMode.cs b/ThScoreFileConverter.Core/Models/Th15/GameMode.cs
index 14a8400a6..09b094688 100644
--- a/ThScoreFileConverter.Core/Models/Th15/GameMode.cs
+++ b/ThScoreFileConverter.Core/Models/Th15/GameMode.cs
@@ -15,12 +15,12 @@ public enum GameMode
     /// <summary>
     /// Represents the Pointdevice Mode.
     /// </summary>
-    [EnumAltName("P")]
+    [Pattern("P")]
     Pointdevice,
 
     /// <summary>
     /// Represents the Legacy Mode.
     /// </summary>
-    [EnumAltName("L")]
+    [Pattern("L")]
     Legacy,
 }
diff --git a/ThScoreFileConverter/Models/Th08/Parsers.cs b/ThScoreFileConverter/Models/Th08/Parsers.cs
index 4fa8ee433..ab48c5eea 100644
--- a/ThScoreFileConverter/Models/Th08/Parsers.cs
+++ b/ThScoreFileConverter/Models/Th08/Parsers.cs
@@ -5,10 +5,12 @@
 // </copyright>
 //-----------------------------------------------------------------------
 
+using ThScoreFileConverter.Core.Models;
 using ThScoreFileConverter.Core.Models.Th08;
-using GameMode = ThScoreFileConverter.Core.Models.GameMode;
 using Level = ThScoreFileConverter.Core.Models.Level;
 using LevelWithTotal = ThScoreFileConverter.Core.Models.LevelWithTotal;
+using Stage = ThScoreFileConverter.Core.Models.Th08.Stage;
+using StageWithTotal = ThScoreFileConverter.Core.Models.Th08.StageWithTotal;
 
 namespace ThScoreFileConverter.Models.Th08;
 
@@ -20,8 +22,7 @@ internal static class Parsers
     /// <summary>
     /// Gets the parser of <see cref="GameMode"/>.
     /// </summary>
-    public static EnumShortNameParser<GameMode> GameModeParser { get; } =
-        new EnumShortNameParser<GameMode>();
+    public static EnumPatternParser<GameMode> GameModeParser { get; } = new();
 
     /// <summary>
     /// Gets the parser of <see cref="Level"/>.
diff --git a/ThScoreFileConverter/Models/Th13/Parsers.cs b/ThScoreFileConverter/Models/Th13/Parsers.cs
index 57b73ff81..ab6ca891d 100644
--- a/ThScoreFileConverter/Models/Th13/Parsers.cs
+++ b/ThScoreFileConverter/Models/Th13/Parsers.cs
@@ -18,8 +18,7 @@ internal static class Parsers
     /// <summary>
     /// Gets the parser of <see cref="GameMode"/>.
     /// </summary>
-    public static EnumShortNameParser<GameMode> GameModeParser { get; } =
-        new EnumShortNameParser<GameMode>();
+    public static EnumPatternParser<GameMode> GameModeParser { get; } = new();
 
     /// <summary>
     /// Gets the parser of <see cref="Level"/>.
diff --git a/ThScoreFileConverter/Models/Th14/Parsers.cs b/ThScoreFileConverter/Models/Th14/Parsers.cs
index 6bd15c57f..4c94a0e60 100644
--- a/ThScoreFileConverter/Models/Th14/Parsers.cs
+++ b/ThScoreFileConverter/Models/Th14/Parsers.cs
@@ -18,8 +18,7 @@ internal static class Parsers
     /// <summary>
     /// Gets the parser of <see cref="GameMode"/>.
     /// </summary>
-    public static EnumShortNameParser<GameMode> GameModeParser { get; } =
-        new EnumShortNameParser<GameMode>();
+    public static EnumPatternParser<GameMode> GameModeParser { get; } = new();
 
     /// <summary>
     /// Gets the parser of <see cref="Level"/>.
diff --git a/ThScoreFileConverter/Models/Th15/Parsers.cs b/ThScoreFileConverter/Models/Th15/Parsers.cs
index 3854c948f..3235c6fe9 100644
--- a/ThScoreFileConverter/Models/Th15/Parsers.cs
+++ b/ThScoreFileConverter/Models/Th15/Parsers.cs
@@ -19,8 +19,7 @@ internal static class Parsers
     /// <summary>
     /// Gets the parser of <see cref="GameMode"/>.
     /// </summary>
-    public static EnumShortNameParser<GameMode> GameModeParser { get; } =
-        new EnumShortNameParser<GameMode>();
+    public static EnumPatternParser<GameMode> GameModeParser { get; } = new();
 
     /// <summary>
     /// Gets the parser of <see cref="Level"/>.
diff --git a/ThScoreFileConverter/Models/Th16/Parsers.cs b/ThScoreFileConverter/Models/Th16/Parsers.cs
index f02892c1d..6e7cc3c5e 100644
--- a/ThScoreFileConverter/Models/Th16/Parsers.cs
+++ b/ThScoreFileConverter/Models/Th16/Parsers.cs
@@ -18,8 +18,7 @@ internal static class Parsers
     /// <summary>
     /// Gets the parser of <see cref="GameMode"/>.
     /// </summary>
-    public static EnumShortNameParser<GameMode> GameModeParser { get; } =
-        new EnumShortNameParser<GameMode>();
+    public static EnumPatternParser<GameMode> GameModeParser { get; } = new();
 
     /// <summary>
     /// Gets the parser of <see cref="Level"/>.
diff --git a/ThScoreFileConverter/Models/Th17/Parsers.cs b/ThScoreFileConverter/Models/Th17/Parsers.cs
index 2e7281ca7..91fa8fadc 100644
--- a/ThScoreFileConverter/Models/Th17/Parsers.cs
+++ b/ThScoreFileConverter/Models/Th17/Parsers.cs
@@ -18,8 +18,7 @@ internal static class Parsers
     /// <summary>
     /// Gets the parser of <see cref="GameMode"/>.
     /// </summary>
-    public static EnumShortNameParser<GameMode> GameModeParser { get; } =
-        new EnumShortNameParser<GameMode>();
+    public static EnumPatternParser<GameMode> GameModeParser { get; } = new();
 
     /// <summary>
     /// Gets the parser of <see cref="Level"/>.
diff --git a/ThScoreFileConverter/Models/Th18/Parsers.cs b/ThScoreFileConverter/Models/Th18/Parsers.cs
index 0f3d057d0..c2c9994bf 100644
--- a/ThScoreFileConverter/Models/Th18/Parsers.cs
+++ b/ThScoreFileConverter/Models/Th18/Parsers.cs
@@ -18,8 +18,7 @@ internal static class Parsers
     /// <summary>
     /// Gets the parser of <see cref="GameMode"/>.
     /// </summary>
-    public static EnumShortNameParser<GameMode> GameModeParser { get; } =
-        new EnumShortNameParser<GameMode>();
+    public static EnumPatternParser<GameMode> GameModeParser { get; } = new();
 
     /// <summary>
     /// Gets the parser of <see cref="Level"/>.