TinyMCE: potential fix for code scanning alert: Inefficient regular expression (#4491)

* Potential fix for code scanning alert no. 102: Inefficient regular expression

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

* Potential fix for code scanning alert no. 109: Inefficient regular expression

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

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Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: sreichel

js/mage/adminhtml/wysiwyg/tinymce/setup.js

@@ -353,7 +353,7 @@ tinyMceWysiwygSetup.prototype =
 
     parseAttributesString: function (attributes) {
         var result = {};
-        attributes.gsub(/(\w+)(?:\s*=\s*(?:(?:"((?:\\.|[^"])*)")|(?:'((?:\\.|[^'])*)')|([^>\s]+)))?/, function (match) {
+        attributes.gsub(/(\w+)(?:\s*=\s*(?:(?:"((?:\\.|[^"\\])*)")|(?:'((?:\\.|[^'\\])*)')|([^>\s]+)))?/, function (match) {
             result[match[1]] = match[2];
         });
         return result;