Escape regex-related characters in string literals.

lib/siren/json_query_nodes.rb

@@ -246,16 +246,19 @@ module Comparator
     module Equal
       def value(expr1, expr2)
         return expr1 == expr2 unless expr2.respond_to?(:gsub)
-        expr2 = expr2.gsub('*', '.*').gsub('?', '.')
-        expr1 =~ %r{^#{expr2}$}
+        expr1 =~ %r{^#{Match.convert(expr2)}$}
       end
     end
 
     module Match
       def value(expr1, expr2)
         return expr1 == expr2 unless expr2.respond_to?(:gsub)
-        expr2 = expr2.gsub('*', '.*').gsub('?', '.')
-        expr1 =~ %r{^#{expr2}$}i
+        expr1 =~ %r{^#{Match.convert(expr2)}$}i
+      end
+
+      def self.convert(string)
+        string.gsub(/([\.\+\[\]\{\}\(\)\^\$])/) { "\\#{$1}" }.
+               gsub('*', '.*').gsub('?', '.')
       end
     end
 

test/test_siren.rb

@@ -129,7 +129,7 @@ def test_filters_with_cross_references
         {:key => [9,5,7], :val => 1..8})
   end
 
-  def test_wildcards
+  def test_string_matching
     assert_equal ["Sayings of the Century", "The Lord of the Rings"],
         Siren.query("$.store.book[? @.title = '* of the *'][= title]", fixtures(:store))
 
@@ -144,6 +144,8 @@ def test_wildcards
 
     assert_equal [],
         Siren.query("$.store.book[? @.title = '? of the ?'][= title]", fixtures(:store))
+
+    assert_equal '302 [QSA,L]', Siren.query("$[? @ = '302 [QSA,L]'][0]", ['302 [QSA,L]'])
   end
 
   def test_bookstore