diff --git a/lib/bcdice/common_command/repeat.rb b/lib/bcdice/common_command/repeat.rb
index a4663e492..3c2d4ba70 100644
--- a/lib/bcdice/common_command/repeat.rb
+++ b/lib/bcdice/common_command/repeat.rb
@@ -1,7 +1,7 @@
 module BCDice
   module CommonCommand
     class Repeat
-      PREFIX_PATTERN = /^(rep|repeat|x)\d+/.freeze
+      PREFIX_PATTERN = /(rep|repeat|x)\d+/.freeze
 
       COMMAND_REGEXP = /\A(?:rep|repeat|x)(\d+)(?: |$)/i.freeze
       REPEAT_LIMIT = 100
diff --git a/test/test_base.rb b/test/test_base.rb
index 42ef7109e..010b93252 100644
--- a/test/test_base.rb
+++ b/test/test_base.rb
@@ -7,7 +7,7 @@ class DummySystem < BCDice::Base
 
 class TestBase < Test::Unit::TestCase
   def test_command_pattern
-    assert_equal(/^S?([\+\-\dD\(\[]+|\d+B\d+|C|choice|D66|\d+R\d+|\d+U\d+|BCDiceVersion|ABC|XYZ|IP\d+)/i, DummySystem.command_pattern)
+    assert_equal(/^S?([\+\-\dD\(\[]+|\d+B\d+|C|choice|D66|\d+R\d+|\d+U\d+|BCDiceVersion|ABC|XYZ|IP\d+|(rep|repeat|x)\d+)/i, DummySystem.command_pattern)
 
     assert(DummySystem.command_pattern.match?("ABC+123"))
     assert(DummySystem.command_pattern.match?("XYZ[hoge]"))
@@ -24,6 +24,9 @@ def test_command_pattern
     assert(DummySystem.command_pattern.match?("1R10+5R6"))
     assert(DummySystem.command_pattern.match?("1U10+2U20"))
     assert(DummySystem.command_pattern.match?("bcdiceversion"))
+    assert(DummySystem.command_pattern.match?("x10 1D6"))
+    assert(DummySystem.command_pattern.match?("rep1 1D6"))
+    assert(DummySystem.command_pattern.match?("repeat10 1D6"))
 
     assert(DummySystem.command_pattern.match?("(1+2)D100<=70"))
     assert(DummySystem.command_pattern.match?("[1...3]D100<=70"))