Swtich to regexp for `DbHelper.remap`.

lib/db_helper.rb

@@ -8,10 +8,8 @@ class DbHelper
        AND (data_type LIKE 'char%' OR data_type LIKE 'text%')
   ORDER BY table_name, column_name"
 
-  def self.remap(from, to, anchor_left: false, anchor_right: false, exclude_tables: [])
+  def self.remap(from, to, exclude_tables: [])
     results = DB.query(REMAP_SQL).to_a
-    like = "#{anchor_left ? '' : "%"}#{from}#{anchor_right ? '' : "%"}"
-
     remappable_columns = {}
 
     results.each do |result|
@@ -24,14 +22,14 @@ class DbHelper
     remappable_columns.each do |table_name, column_names|
       next if exclude_tables.include?(table_name)
       set_clause = column_names.map do |column_name|
-        "#{column_name} = REPLACE(#{column_name}, :from, :to)"
+        "#{column_name} = REGEXP_REPLACE(#{column_name}, :from, :to)"
       end.join(", ")
 
       where_clause = column_names.map do |column_name|
-        "#{column_name} LIKE :like"
+        "#{column_name} ~* :from"
       end.join(" OR ")
 
-      DB.exec(<<~SQL, from: from, to: to, like: like)
+      DB.exec(<<~SQL, from: from, to: to, from: from)
         UPDATE #{table_name}
         SET #{set_clause}
         WHERE #{where_clause}

spec/lib/db_helper_spec.rb

@@ -40,5 +40,29 @@ RSpec.describe DbHelper do
 
       expect(post.reload.cooked).to eq('test')
     end
+
+    it 'accepts a POSIX regular expression' do
+      url = "https://some.complicated.url/that/I/can/come/up.with"
+
+      post = Fabricate(:post,
+        cooked: "something something#{url}something something"
+      )
+
+      url2 = "https://some.other.complicated/url/I/can/come/up.with"
+
+      post2 = Fabricate(:post,
+        cooked: "something #{url2} something something"
+      )
+
+      DbHelper.remap("(#{url}|#{url2})", "DISCOURSE!")
+
+      expect(post.reload.cooked).to eq(
+        'something somethingDISCOURSE!something something'
+      )
+
+      expect(post2.reload.cooked).to eq(
+        "something DISCOURSE! something something"
+      )
+    end
   end
 end