diff --git a/playa/psparser.py b/playa/psparser.py
index e2c0c9c..4a38e68 100755
--- a/playa/psparser.py
+++ b/playa/psparser.py
@@ -605,7 +605,7 @@ def _parse_hexstring(self) -> bytes:
 )
 STRLEXER = re.compile(
     rb"""(?:
-      (?P<octal> \\\d{1,3})
+      (?P<octal> \\[0-7]{1,3})
     | (?P<linebreak> \\(?:\r\n?|\n))
     | (?P<escape> \\.)
     | (?P<parenleft> \()