1 files changed, 37 insertions, 0 deletions
diff --git a/lib/gitlab/ci/pipeline/expression/lexeme/pattern/regular_expression.rb b/lib/gitlab/ci/pipeline/expression/lexeme/pattern/regular_expression.rb
new file mode 100644
index 00000000000..5b771abf4ba
--- /dev/null
+++ b/lib/gitlab/ci/pipeline/expression/lexeme/pattern/regular_expression.rb
@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Ci
+    module Pipeline
+      module Expression
+        module Lexeme
+          class Pattern
+            require_dependency 're2'
+            class RegularExpression
+              include Gitlab::Utils::StrongMemoize
+
+              attr_reader :value
+
+              def initialize(value)
+                @value = value
+              end
+
+              def expression
+                Gitlab::SafeRequestStore.fetch("#{self.class}#unsafe_regexp:#{value}") do
+                  Gitlab::UntrustedRegexp::RubySyntax.fabricate!(value)
+                end
+              end
+              strong_memoize_attr :expression
+
+              def valid?
+                !!expression
+              rescue RegexpError
+                false
+              end
+            end
+          end
+        end
+      end
+    end
+  end
+end