fix: handle mulitple escape sequences leading to quote

Author: frankdugan3

lib/migration_generator/operation.ex

@@ -1351,7 +1351,7 @@ defmodule AshPostgres.MigrationGenerator.Operation do
           },
           table: table
         }) do
-      check = String.replace(check, ~S["], ~S[\"])
+      check = String.replace(check, ~r/((?:\\)*)"/, ~S[\1\"])
 
       if base_filter do
         "create constraint(:#{as_atom(table)}, :#{as_atom(name)}, #{join(["check: \"(#{check}) OR NOT (#{base_filter})\")", option(:prefix, schema)])}"
@@ -1388,7 +1388,7 @@ defmodule AshPostgres.MigrationGenerator.Operation do
           schema: schema,
           table: table
         }) do
-      check = String.replace(check, ~S["], ~S[\"])
+      check = String.replace(check, ~r/((?:\\)*)"/, ~S[\1\"])
 
       if base_filter do
         "create constraint(:#{as_atom(table)}, :#{as_atom(name)}, #{join(["check: \"#{base_filter} AND #{check}\")", option(:prefix, schema)])}"

test/migration_generator_test.exs

@@ -2240,11 +2240,16 @@ defmodule AshPostgres.MigrationGeneratorTest do
         attributes do
           uuid_primary_key(:id)
           attribute(:price, :integer, public?: true)
+          attribute(:title, :string, public?: true)
         end
 
         postgres do
           check_constraints do
             check_constraint(:price, "price_must_be_positive", check: ~S["price" > 0])
+
+            check_constraint(:title, "title_must_conform_to_format",
+              check: "title ~= '(\"\\\"\\\\\")'"
+            )
           end
         end
       end
@@ -2270,6 +2275,9 @@ defmodule AshPostgres.MigrationGeneratorTest do
       assert file =~
                ~S[create constraint(:posts, :price_must_be_positive, check: "\"price\" > 0")]
 
+      assert file =~
+               "create constraint(:posts, :title_must_conform_to_format, check: \"title ~= '(\\\"\\\\\"\\\\\\\")'\""
+
       defposts do
         attributes do
           uuid_primary_key(:id)