diff --git a/src/py/CHANGELOG.txt b/src/py/CHANGELOG.txt
index a4ff80ce..39027af5 100644
--- a/src/py/CHANGELOG.txt
+++ b/src/py/CHANGELOG.txt
@@ -1,3 +1,6 @@
+v1.0.0rc15
+- BUG: Add regex sanitization for auto-filename generation
+
 v1.0.0rc14
 - Pass `plotlyjs` option through from Kaleido() to PageGenerator()
 
diff --git a/src/py/kaleido/_fig_tools.py b/src/py/kaleido/_fig_tools.py
index 84e5daa5..776f8065 100644
--- a/src/py/kaleido/_fig_tools.py
+++ b/src/py/kaleido/_fig_tools.py
@@ -1,3 +1,4 @@
+import glob
 import re
 from pathlib import Path
 
@@ -91,10 +92,14 @@ def to_spec(figure, layout_opts):
 
 def _next_filename(path, prefix, ext):
     default = 1 if (path / f"{prefix}.{ext}").exists() else 0
-    re_number = re.compile(r"^" + prefix + r"-(\d+)\." + ext + r"$")
+    re_number = re.compile(
+        r"^" + re.escape(prefix) + r"\-(\d+)\." + re.escape(ext) + r"$",
+    )
+    escaped_prefix = glob.escape(prefix)
+    escaped_ext = glob.escape(ext)
     numbers = [
         int(match.group(1))
-        for name in path.glob(f"{prefix}-*.{ext}")
+        for name in path.glob(f"{escaped_prefix}-*.{escaped_ext}")
         if (match := re_number.match(Path(name).name))
     ]
     n = max(numbers, default=default) + 1