Partially Revert "Use regex.test() when we want to check for a Boolean. (#29969)" (#30770)

This partially reverts commit 9c2b9ac7.

js/src/util/sanitizer.js

@@ -37,7 +37,7 @@ const allowedAttribute = (attr, allowedAttributeList) => {
 
   if (allowedAttributeList.indexOf(attrName) !== -1) {
     if (uriAttrs.indexOf(attrName) !== -1) {
-      return SAFE_URL_PATTERN.test(attr.nodeValue) || DATA_URL_PATTERN.test(attr.nodeValue)
+      return Boolean(attr.nodeValue.match(SAFE_URL_PATTERN) || attr.nodeValue.match(DATA_URL_PATTERN))
     }
 
     return true
@@ -47,7 +47,7 @@ const allowedAttribute = (attr, allowedAttributeList) => {
 
   // Check if a regular expression validates the attribute.
   for (let i = 0, len = regExp.length; i < len; i++) {
-    if (regExp[i].test(attrName)) {
+    if (attrName.match(regExp[i])) {
       return true
     }
   }