diff --git a/README.md b/README.md
index 7c92307..d8ce7a7 100644
--- a/README.md
+++ b/README.md
@@ -73,7 +73,7 @@ These features are planned to be implemented in the near future:
 
 ## Comparison to other parsers
 
-This is a feature comparison. For benchmarks vs pyparsing, check out the [JSON tutorial](/docs/json_tutorial.md#conclusion).
+This is a feature comparison. For benchmarks vs other parsers, check out the [JSON tutorial](/docs/json_tutorial.md#conclusion).
 
 | Library | Algorithm | LOC | Grammar | Builds tree?
 |:--------|:----------|:----|:--------|:------------
diff --git a/lark/load_grammar.py b/lark/load_grammar.py
index e7d1bf4..9e2f0c4 100644
--- a/lark/load_grammar.py
+++ b/lark/load_grammar.py
@@ -261,6 +261,7 @@ class ExtractAnonTokens(InlineTransformer):
 
         elif token.type == 'REGEXP':
             token_name = 'ANONRE_%d' % self.i
+            value = token.value
             self.i += 1
         else:
             assert False, x
@@ -268,6 +269,8 @@ class ExtractAnonTokens(InlineTransformer):
         if token_name not in self.token_set:
             self.token_set.add(token_name)
             self.tokens.append((token_name, token, []))
+            assert value not in self.token_reverse
+            self.token_reverse[value] = token_name
 
         return Token('TOKEN', token_name, -1)