diff --git a/MultiversalDiplomacy/Model/Regex.cs b/MultiversalDiplomacy/Model/Regex.cs
index e79bc09..d2eaae3 100644
--- a/MultiversalDiplomacy/Model/Regex.cs
+++ b/MultiversalDiplomacy/Model/Regex.cs
@@ -5,6 +5,11 @@ using MultiversalDiplomacy.Orders;
 
 namespace MultiversalDiplomacy.Model;
 
+/// <summary>
+/// This class defines the regular expressions that are used to build up larger expressions for matching orders
+/// and other script inputs. It also provides helper functions to extract the captured order elements as tuples,
+/// which function as the structured intermediate representation between raw user input and full Order objects.
+/// </summary>
 public class OrderRegex(World world)
 {
     public const string Type = "(A|F|Army|Fleet)";
@@ -25,6 +30,8 @@ public class OrderRegex(World world)
 
     public const string MoveVerb = "(-|(?:->)|(?:=>)|(?:attack(?:s)?)|(?:move(?:s)?(?: to)?))";
 
+    public const string SupportVerb = "(s|support|supports)";
+
     public const string ViaConvoy = "(convoy|via convoy|by convoy)";
 
     public Regex Hold => new(
@@ -81,6 +88,39 @@ public class OrderRegex(World world)
             match.Groups[12].Value,
             match.Groups[13].Value);
 
+    public Regex SupportHold => new(
+        $"^{UnitSpec} {SupportVerb} {UnitSpec}$",
+        RegexOptions.IgnoreCase);
+
+    public static (
+        string type,
+        string timeline,
+        string province,
+        string location,
+        string turn,
+        string supportVerb,
+        string targetType,
+        string targetTimeline,
+        string targetProvince,
+        string targetLocation,
+        string targetTurn)
+        ParseSupportHold(Match match) => (
+            match.Groups[1].Value,
+            match.Groups[2].Value,
+            match.Groups[3].Value,
+            match.Groups[4].Length > 0
+                ? match.Groups[4].Value
+                : match.Groups[5].Value,
+            match.Groups[6].Value,
+            match.Groups[7].Value,
+            match.Groups[8].Value,
+            match.Groups[9].Value,
+            match.Groups[10].Value,
+            match.Groups[11].Length > 0
+                ? match.Groups[11].Value
+                : match.Groups[12].Value,
+            match.Groups[13].Value);
+
     public static bool TryParseUnit(World world, string unitSpec, [NotNullWhen(true)] out Unit? newUnit)
     {
         newUnit = null;
diff --git a/MultiversalDiplomacyTests/RegexTest.cs b/MultiversalDiplomacyTests/RegexTest.cs
index 5b10af7..1e07da2 100644
--- a/MultiversalDiplomacyTests/RegexTest.cs
+++ b/MultiversalDiplomacyTests/RegexTest.cs
@@ -70,10 +70,18 @@ public class RegexTest
         yield return Test(
             "A F-STP - MOS",
             "A", "F", "STP", "", "", "-", "", "MOS", "", "", "");
+        // No confusion of timeline and hold verb
+        yield return Test(
+            "A Mun - h-Tyr",
+            "A", "", "Mun", "", "", "-", "h", "Tyr", "", "", "");
+        // No confusion of timeline and support verb
+        yield return Test(
+            "A Mun - s-Tyr",
+            "A", "", "Mun", "", "", "-", "s", "Tyr", "", "", "");
         // Elements with spaces
         yield return Test(
-            "Fleet Western Mediterranean Sea moves to Gulf of Lyons via convoy",
-            "Fleet", "", "Western Mediterranean Sea", "", "", "moves to", "", "Gulf of Lyons", "", "", "via convoy");
+            "Western Mediterranean Sea moves to Gulf of Lyons via convoy",
+            "", "", "Western Mediterranean Sea", "", "", "moves to", "", "Gulf of Lyons", "", "", "via convoy");
         // Parenthesis location
         yield return Test(
             "F Spain(nc) - Spain(sc)",
@@ -98,4 +106,57 @@ public class RegexTest
         Assert.That(actual, Is.EquivalentTo(expected), "Unexpected parse results");
         Assert.That(actual, Is.EqualTo(expected), "Unexpected parse results");
     }
+
+    static IEnumerable<TestCaseData> SupportHoldRegexMatchesTestCases()
+    {
+        static TestCaseData Test(string order, params string[] expected)
+            => new TestCaseData(order, expected).SetName($"{{m}}(\"{order}\")");
+        // Full specification
+        yield return Test(
+            "Army a-Munich/l@0 s A a-Tyrolia/l@0",
+            "Army", "a", "Munich", "l", "0", "s", "A", "a", "Tyrolia", "l", "0");
+        // Case insensitivity
+        yield return Test(
+            "fleet B-lon/C@0 SUPPORTS B-enc/W@0",
+            "fleet", "B", "lon", "C", "0", "SUPPORTS", "", "B", "enc", "W", "0");
+        // All optionals missing
+        yield return Test(
+            "ROM s VIE",
+            "", "", "ROM", "", "", "s", "", "", "VIE", "", "");
+        // No confusion of unit type and timeline
+        yield return Test(
+            "A F-STP s MOS",
+            "A", "F", "STP", "", "", "s", "", "", "MOS", "", "");
+        // No confusion of timeline and support verb
+        yield return Test(
+            "A Mun s Tyr",
+            "A", "", "Mun", "", "", "s", "", "", "Tyr", "", "");
+        // Elements with spaces
+        yield return Test(
+            "Western Mediterranean Sea supports Gulf of Lyons",
+            "", "", "Western Mediterranean Sea", "", "", "supports", "", "", "Gulf of Lyons", "", "");
+        // Parenthesis location
+        yield return Test(
+            "F Spain(nc) s Spain(sc)",
+            "F", "", "Spain", "nc", "", "s", "", "", "Spain", "sc", "");
+        // Timeline designation spells out a province
+        yield return Test(
+            "A tyr-MUN(vie) s mun-TYR/vie",
+            "A", "tyr", "MUN", "vie", "", "s", "", "mun", "TYR", "vie", "");
+    }
+
+    [TestCaseSource(nameof(SupportHoldRegexMatchesTestCases))]
+    public void SupportHoldRegexMatches(string order, string[] expected)
+    {
+        OrderRegex re = new(World.WithStandardMap());
+        var match = re.SupportHold.Match(order);
+        Assert.True(match.Success, "Match failed");
+        var (type, timeline, province, location, turn, supportVerb,
+            targetType, targetTimeline, targetProvince, targetLocation, targetTurn) = OrderRegex.ParseSupportHold(match);
+        string[] actual = [type, timeline, province, location, turn, supportVerb,
+            targetType, targetTimeline, targetProvince, targetLocation, targetTurn];
+        // Use EquivalentTo for more detailed error message
+        Assert.That(actual, Is.EquivalentTo(expected), "Unexpected parse results");
+        Assert.That(actual, Is.EqualTo(expected), "Unexpected parse results");
+    }
 }