Implement variables expression untrusted pattern lexeme

1 files changed, 26 insertions, 0 deletions

diff --git a/lib/gitlab/ci/pipeline/expression/lexeme/pattern.rb b/lib/gitlab/ci/pipeline/expression/lexeme/pattern.rb
new file mode 100644
index 00000000000..8cb1af30252
--- /dev/null
+++ b/lib/gitlab/ci/pipeline/expression/lexeme/pattern.rb
@@ -0,0 +1,26 @@
+module Gitlab
+  module Ci
+    module Pipeline
+      module Expression
+        module Lexeme
+          class Pattern < Lexeme::Value
+            PATTERN = %r{/(?<regexp>.+)/}.freeze
+
+            def initialize(regexp)
+              @value = regexp
+            end
+
+            def evaluate(variables = {})
+              Gitlab::UntrustedRegexp.new(@value.to_s)
+              # TODO raise LexerError / ParserError in case of RegexpError
+            end
+
+            def self.build(string)
+              new(string.match(PATTERN)[:regexp])
+            end
+          end
+        end
+      end
+    end
+  end
+end