diff --git a/lib/variables.js b/lib/variables.js
index 95c79cc..01647bd 100644
--- a/lib/variables.js
+++ b/lib/variables.js
@@ -12,28 +12,22 @@ const uniqueString = (string) => {
  */
 export const replaceVariables = (el, value) => {
 
-  // find non-nested css function calls
-  // eg: rgb(...), drop-shadow(...)
-  const funcReg = /([a-z\-]+)\s*\(\s*([^\(\)]*?)\s*(?:,\s*([^\(\)]*?)\s*)?\s*\)/i;
   const replacements = [];
-  let match;
   const uniq = uniqueString(value);
+  let funcReg = /([a-z\-]+)\s*\(\s*([^,\(\)]*)\s*(?:,\s*([^,\(\)]*)\s*)?\)/i;
+  let match;
 
   while ((match = funcReg.exec(value)) !== null) {
     const i = `${replacements.length}`;
 
-    // attempt to resolve variables
     if (match[1].toLowerCase() == 'var') {
       const varValue = findVariableValue(el, match[2]);
 
-      // found variable value
       if (varValue) {
         value = value.replace(match[0], varValue);
         continue;
       }
 
-      // use default value
-      // var(--name , default-value)
       if (match[3]) {
         value = value.replace(match[0], match[3]);
         continue;