installed plugin W3 Total Cache version 2.3.2

wp-content/plugins/w3-total-cache/pub/js/options-validator.js

@@ -0,0 +1,22 @@
+jQuery(document).ready(function() {
+	jQuery('textarea[w3tc-data-validator="regexps"]').change(function() {
+		var v = jQuery(this).val();
+		var items = v.split("\n");
+
+		for (var n = 0; n < items.length; n++) {
+			var regexp = items[n].trim();
+			if (regexp.length > 0) {
+				try {
+					new RegExp(regexp);
+				} catch(e) {
+					var error = 'Contains invalid regexp ' + regexp +', please fix';
+					console.log(error);
+					jQuery(this)[0].setCustomValidity(error);
+					return;
+				}
+			}
+		}
+
+		jQuery(this)[0].setCustomValidity('');
+	});
+});