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Show details when a regex fails to compile (GH-2678)
[etc/vim.git] / src / black / __init__.py
index 1923c069edec794956a3c5a4506ce1ca7a4cea03..e2376c45617469d7890c0036c15fc4ac7139c27b 100644 (file)
@@ -177,8 +177,8 @@ def validate_regex(
 ) -> Optional[Pattern[str]]:
     try:
         return re_compile_maybe_verbose(value) if value is not None else None
-    except re.error:
-        raise click.BadParameter("Not a valid regular expression") from None
+    except re.error as e:
+        raise click.BadParameter(f"Not a valid regular expression: {e}") from None
 
 
 @click.command(