diff --git a/app/validators/json_schemas/catalog_resource_component_inputs.json b/app/validators/json_schemas/catalog_resource_component_inputs.json
index 014a52d4f1bbb51904a9ff2672fdcc76c426950d..830bf68483882c5d0f1c49e2ed2ecba3e507bea5 100644
--- a/app/validators/json_schemas/catalog_resource_component_inputs.json
+++ b/app/validators/json_schemas/catalog_resource_component_inputs.json
@@ -15,6 +15,9 @@
             "boolean"
           ]
         },
+        "regex": {
+          "type": "string"
+        },
         "^type$": {
           "type": "string"
         }
diff --git a/lib/gitlab/ci/config/header/input.rb b/lib/gitlab/ci/config/header/input.rb
index ed293cb6f4b6ccdec176cd7f90c6a5ed71327ec2..dcb960064597376adb0a3791e0e19491c2f75a9a 100644
--- a/lib/gitlab/ci/config/header/input.rb
+++ b/lib/gitlab/ci/config/header/input.rb
@@ -11,14 +11,17 @@ class Input < ::Gitlab::Config::Entry::Node
           include ::Gitlab::Config::Entry::Validatable
           include ::Gitlab::Config::Entry::Attributable
 
-          attributes :default, :description, :type, prefix: :input
+          ALLOWED_KEYS = %i[default description regex type].freeze
+
+          attributes ALLOWED_KEYS, prefix: :input
 
           validations do
-            validates :config, type: Hash, allowed_keys: [:default, :type, :description]
+            validates :config, type: Hash, allowed_keys: ALLOWED_KEYS
             validates :key, alphanumeric: true
             validates :input_default, alphanumeric: true, allow_nil: true
-            validates :input_type, allow_nil: true, allowed_values: Interpolation::Inputs.input_types
             validates :input_description, alphanumeric: true, allow_nil: true
+            validates :input_regex, type: String, allow_nil: true
+            validates :input_type, allow_nil: true, allowed_values: Interpolation::Inputs.input_types
           end
         end
       end
diff --git a/lib/gitlab/ci/config/interpolation/inputs/base_input.rb b/lib/gitlab/ci/config/interpolation/inputs/base_input.rb
index 5648c4d31eaab35f35eb7692f8733106b35ecacf..ba5197766359f2feb1328a44017911c39d061e5c 100644
--- a/lib/gitlab/ci/config/interpolation/inputs/base_input.rb
+++ b/lib/gitlab/ci/config/interpolation/inputs/base_input.rb
@@ -62,7 +62,15 @@ def validate!
               end
 
               # validate provided value
-              error("provided value is not a #{self.class.type_name}") unless valid_value?(actual_value)
+              return error("provided value is not a #{self.class.type_name}") unless valid_value?(actual_value)
+
+              validate_regex!
+            end
+
+            def validate_regex!
+              return unless spec.key?(:regex)
+
+              error('RegEx validation can only be used with string inputs')
             end
 
             def error(message)
diff --git a/lib/gitlab/ci/config/interpolation/inputs/string_input.rb b/lib/gitlab/ci/config/interpolation/inputs/string_input.rb
index 39870582d0c0d33f41ad06a11a55705009ab44e8..9b695d168da46b4bc78c32d3f2d7199f399a43b3 100644
--- a/lib/gitlab/ci/config/interpolation/inputs/string_input.rb
+++ b/lib/gitlab/ci/config/interpolation/inputs/string_input.rb
@@ -25,6 +25,19 @@ def self.type_name
             def valid_value?(value)
               value.nil? || value.is_a?(String)
             end
+
+            private
+
+            def validate_regex!
+              return unless spec.key?(:regex)
+              return if actual_value.match?(spec[:regex])
+
+              if value.nil?
+                error('default value does not match required RegEx pattern')
+              else
+                error('provided value does not match required RegEx pattern')
+              end
+            end
           end
         end
       end
diff --git a/spec/lib/gitlab/ci/config/header/input_spec.rb b/spec/lib/gitlab/ci/config/header/input_spec.rb
index b4e02c2b005012f743ddac10ae447fecdfc56d59..5d1fa4a8e6ef966d5eaa56a15ddb519b3d63e66d 100644
--- a/spec/lib/gitlab/ci/config/header/input_spec.rb
+++ b/spec/lib/gitlab/ci/config/header/input_spec.rb
@@ -68,6 +68,12 @@
     end
   end
 
+  context 'when the input has RegEx validation' do
+    let(:input_hash) { { regex: '\w+' } }
+
+    it_behaves_like 'a valid input'
+  end
+
   context 'when given an invalid type' do
     let(:input_hash) { { type: 'datetime' } }
     let(:expected_errors) { ['foo input type unknown value: datetime'] }
@@ -90,4 +96,11 @@
 
     it_behaves_like 'an invalid input'
   end
+
+  context 'when RegEx validation value is not a string' do
+    let(:input_hash) { { regex: [] } }
+    let(:expected_errors) { ['foo input regex should be a string'] }
+
+    it_behaves_like 'an invalid input'
+  end
 end
diff --git a/spec/lib/gitlab/ci/config/interpolation/inputs_spec.rb b/spec/lib/gitlab/ci/config/interpolation/inputs_spec.rb
index ea06f181fa4a5dd45fdeb16ecf5fcf1c43dd3955..c7ec0a341192300903254f37ef60a87ea0070382 100644
--- a/spec/lib/gitlab/ci/config/interpolation/inputs_spec.rb
+++ b/spec/lib/gitlab/ci/config/interpolation/inputs_spec.rb
@@ -57,6 +57,16 @@
           { default_boolean_input: { default: true, type: 'boolean' } },
           {},
           { default_boolean_input: true }
+        ],
+        [
+          { test_input: { regex: '^input_value$' } },
+          { test_input: 'input_value' },
+          { test_input: 'input_value' }
+        ],
+        [
+          { test_input: { regex: '^input_value$', default: 'input_value' } },
+          {},
+          { test_input: 'input_value' }
         ]
       ]
     end
@@ -123,6 +133,21 @@
           { default_boolean_input: { default: 'string', type: 'boolean' } },
           {},
           ['`default_boolean_input` input: default value is not a boolean']
+        ],
+        [
+          { test_input: { regex: '^input_value$' } },
+          { test_input: 'input' },
+          ['`test_input` input: provided value does not match required RegEx pattern']
+        ],
+        [
+          { test_input: { regex: '^input_value$', default: 'default' } },
+          {},
+          ['`test_input` input: default value does not match required RegEx pattern']
+        ],
+        [
+          { test_input: { regex: '^input_value$', type: 'number' } },
+          { test_input: 999 },
+          ['`test_input` input: RegEx validation can only be used with string inputs']
         ]
       ]
     end