diff --git a/test/fixtures/test_grammars/aliased_rules/grammar.json b/test/fixtures/test_grammars/aliased_rules/grammar.json
index 289fd0ea..391f780f 100644
--- a/test/fixtures/test_grammars/aliased_rules/grammar.json
+++ b/test/fixtures/test_grammars/aliased_rules/grammar.json
@@ -66,6 +66,6 @@
       }
     },
 
-    "identifier": {"type": "PATTERN", "value": "\\a+"}
+    "identifier": {"type": "PATTERN", "value": "[a-z]+"}
   }
 }
diff --git a/test/fixtures/test_grammars/conflict_in_repeat_rule/grammar.json b/test/fixtures/test_grammars/conflict_in_repeat_rule/grammar.json
index 67c05355..45d0922a 100644
--- a/test/fixtures/test_grammars/conflict_in_repeat_rule/grammar.json
+++ b/test/fixtures/test_grammars/conflict_in_repeat_rule/grammar.json
@@ -71,6 +71,6 @@
       ]
     },
 
-    "identifier": {"type": "PATTERN", "value": "\\a+"}
+    "identifier": {"type": "PATTERN", "value": "[a-z]+"}
   }
-}
\ No newline at end of file
+}
diff --git a/test/fixtures/test_grammars/external_and_internal_anonymous_tokens/grammar.json b/test/fixtures/test_grammars/external_and_internal_anonymous_tokens/grammar.json
index e62c5b7c..057bdbf0 100644
--- a/test/fixtures/test_grammars/external_and_internal_anonymous_tokens/grammar.json
+++ b/test/fixtures/test_grammars/external_and_internal_anonymous_tokens/grammar.json
@@ -29,7 +29,7 @@
       ]
     },
 
-    "variable": {"type": "PATTERN", "value": "\\a+"},
+    "variable": {"type": "PATTERN", "value": "[a-z]+"},
     "number": {"type": "PATTERN", "value": "\\d+"}
   }
-}
\ No newline at end of file
+}
diff --git a/test/fixtures/test_grammars/external_and_internal_tokens/grammar.json b/test/fixtures/test_grammars/external_and_internal_tokens/grammar.json
index 63ce1c33..62d77383 100644
--- a/test/fixtures/test_grammars/external_and_internal_tokens/grammar.json
+++ b/test/fixtures/test_grammars/external_and_internal_tokens/grammar.json
@@ -29,8 +29,8 @@
       ]
     },
 
-    "variable": {"type": "PATTERN", "value": "\\a+"},
+    "variable": {"type": "PATTERN", "value": "[a-z]+"},
     "number": {"type": "PATTERN", "value": "\\d+"},
     "line_break": {"type": "STRING", "value": "\n"}
   }
-}
\ No newline at end of file
+}
diff --git a/test/fixtures/test_grammars/external_extra_tokens/grammar.json b/test/fixtures/test_grammars/external_extra_tokens/grammar.json
index a836b289..1f57d593 100644
--- a/test/fixtures/test_grammars/external_extra_tokens/grammar.json
+++ b/test/fixtures/test_grammars/external_extra_tokens/grammar.json
@@ -20,6 +20,6 @@
       ]
     },
 
-    "variable": {"type": "PATTERN", "value": "\\a+"}
+    "variable": {"type": "PATTERN", "value": "[a-z]+"}
   }
-}
\ No newline at end of file
+}
diff --git a/test/fixtures/test_grammars/external_tokens/grammar.json b/test/fixtures/test_grammars/external_tokens/grammar.json
index 1d64915b..d61a978f 100644
--- a/test/fixtures/test_grammars/external_tokens/grammar.json
+++ b/test/fixtures/test_grammars/external_tokens/grammar.json
@@ -51,7 +51,7 @@
 
     "identifier": {
       "type": "PATTERN",
-      "value": "\\a+"
+      "value": "[a-z]+"
     }
   }
-}
\ No newline at end of file
+}
diff --git a/test/fixtures/test_grammars/inlined_aliased_rules/grammar.json b/test/fixtures/test_grammars/inlined_aliased_rules/grammar.json
index b0c121c0..bdf01789 100644
--- a/test/fixtures/test_grammars/inlined_aliased_rules/grammar.json
+++ b/test/fixtures/test_grammars/inlined_aliased_rules/grammar.json
@@ -70,6 +70,6 @@
       }
     },
 
-    "identifier": {"type": "PATTERN", "value": "\\a+"}
+    "identifier": {"type": "PATTERN", "value": "[a-z]+"}
   }
 }
diff --git a/test/fixtures/test_grammars/inverted_external_token/grammar.json b/test/fixtures/test_grammars/inverted_external_token/grammar.json
index dc837948..a43cedcc 100644
--- a/test/fixtures/test_grammars/inverted_external_token/grammar.json
+++ b/test/fixtures/test_grammars/inverted_external_token/grammar.json
@@ -49,7 +49,7 @@
 
     "identifier": {
       "type": "PATTERN",
-      "value": "\\a+"
+      "value": "[a-z]+"
     }
   }
 }
diff --git a/test/fixtures/test_grammars/partially_resolved_conflict/grammar.json b/test/fixtures/test_grammars/partially_resolved_conflict/grammar.json
index 4d64b4eb..adca84d9 100644
--- a/test/fixtures/test_grammars/partially_resolved_conflict/grammar.json
+++ b/test/fixtures/test_grammars/partially_resolved_conflict/grammar.json
@@ -52,7 +52,7 @@
 
     "identifier": {
       "type": "PATTERN",
-      "value": "\\a+"
+      "value": "[a-z]+"
     }
   }
-}
\ No newline at end of file
+}