Fix setting default config values for multi-threaded applciations

lib/regexp-examples/constants.rb

@@ -33,7 +33,11 @@ def config=(**args)
       end
 
       def config
-        Thread.current[:regexp_examples_config] ||= {}
+        Thread.current[:regexp_examples_config] ||= {
+          max_repeater_variance: MAX_REPEATER_VARIANCE_DEFAULT,
+          max_group_results: MAX_GROUP_RESULTS_DEFAULT,
+          max_results_limit: MAX_RESULTS_LIMIT_DEFAULT
+        }
       end
     end
     # The maximum variance for any given repeater, to prevent a huge/infinite number of
@@ -44,21 +48,18 @@ def config
     # .{,3} is equivalent to .{0,2}
     # .{3,8} is equivalent to .{3,5}
     MAX_REPEATER_VARIANCE_DEFAULT = 2
-    self.max_repeater_variance = MAX_REPEATER_VARIANCE_DEFAULT
 
     # Maximum number of characters returned from a char set, to reduce output spam
     # For example, if self.max_group_results = 5 then:
     # \d is equivalent to [01234]
     # \w is equivalent to [abcde]
     MAX_GROUP_RESULTS_DEFAULT = 5
-    self.max_group_results = MAX_GROUP_RESULTS_DEFAULT
 
     # Maximum number of results to be generated, for Regexp#examples
     # This is to prevent the system "freezing" when given instructions like:
     # /[ab]{30}/.examples
     # (Which would attempt to generate 2**30 == 1073741824 examples!!!)
     MAX_RESULTS_LIMIT_DEFAULT = 10_000
-    self.max_results_limit = MAX_RESULTS_LIMIT_DEFAULT
   end
 
   # Definitions of various special characters, used in regular expressions.