diff --git a/snippets/toSnakeCase.md b/snippets/toSnakeCase.md
index 6a82a5ba2..957fd3a78 100644
--- a/snippets/toSnakeCase.md
+++ b/snippets/toSnakeCase.md
@@ -6,7 +6,7 @@ Use `replace()` to add underscores before capital letters, convert `toLowerCase(
 
 ```js
 const toSnakeCase = str =>
-  str.replace(/(\w)([A-Z])/g, '$1_$2').replace(/[\s-]/g, '_').toLowerCase();
+  str.replace(/(\w)([A-Z])/g, '$1_$2').replace(/[\s-_]+/g, '_').toLowerCase();
 // toSnakeCase("camelCase") -> 'camel_case'
 // toSnakeCase("some text") -> 'some_text'
 // toSnakeCase("some-javascript-property") -> 'some_javascript_property'