Add `reference_pattern` to Referable models

1 files changed, 16 insertions, 0 deletions

diff --git a/app/models/label.rb b/app/models/label.rb
index 013e6bf5978..8980049cef8 100644
--- a/app/models/label.rb
+++ b/app/models/label.rb
@@ -40,6 +40,22 @@ class Label < ActiveRecord::Base
     '~'
   end
 
+  # Pattern used to extract label references from text
+  #
+  # TODO (rspeicher): Limit to double quotes (meh) or disallow single quotes in label names (bad).
+  def self.reference_pattern
+    %r{
+      #{reference_prefix}
+      (?:
+        (?<label_id>\d+)   | # Integer-based label ID, or
+        (?<label_name>
+          [A-Za-z0-9_-]+   | # String-based single-word label title
+          ['"][^&\?,]+['"]   # String-based multi-word label surrounded in quotes
+        )
+      )
+    }x
+  end
+
   # Returns the String necessary to reference this Label in Markdown
   #
   # format - Symbol format to use (default: :id, optional: :name)