diff --git a/src/lib/validators.ts b/src/lib/validators.ts
index 0789db12..9f5c08d8 100644
--- a/src/lib/validators.ts
+++ b/src/lib/validators.ts
@@ -5,8 +5,8 @@ const tshirtUnitRegex = /^(\d+(\.\d+)?)?(xs|sm|md|lg|xl)$/
 const lengthUnitRegex =
     /\d+(%|px|r?em|[sdl]?v([hwib]|min|max)|pt|pc|in|cm|mm|cap|ch|ex|r?lh|cq(w|h|i|b|min|max))|\b(calc|min|max|clamp)\(.+\)|^0$/
 const colorFunctionRegex = /^(rgba?|hsla?|hwb|(ok)?(lab|lch))\(.+\)$/
-// Shadow always begins with x and y offset separated by underscore
-const shadowRegex = /^-?((\d+)?\.?(\d+)[a-z]+|0)_-?((\d+)?\.?(\d+)[a-z]+|0)/
+// Shadow always begins with x and y offset separated by underscore optionally prepended by inset
+const shadowRegex = /^(inset_)?-?((\d+)?\.?(\d+)[a-z]+|0)_-?((\d+)?\.?(\d+)[a-z]+|0)/
 const imageRegex =
     /^(url|image|image-set|cross-fade|element|(repeating-)?(linear|radial|conic)-gradient)\(.+\)$/