[removeElementsByAttr] fix removing elements when class is empty

Ref #937

Regexp didn't not cover the case when class list is empty.

plugins/removeElementsByAttr.js

@@ -7,8 +7,8 @@ exports.active = false;
 exports.description = 'removes arbitrary elements by ID or className (disabled by default)';
 
 exports.params = {
-    id: [],
-    class: []
+  id: [],
+  class: []
 };
 
 /**
@@ -51,30 +51,28 @@ exports.params = {
  * @author Eli Dupuis (@elidupuis)
  */
 exports.fn = function(item, params) {
-    var elemId, elemClass;
-
-    // wrap params in an array if not already
-    ['id', 'class'].forEach(function(key) {
-        if (!Array.isArray(params[key])) {
-            params[key] = [ params[key] ];
-        }
-    });
-
-    // abort if current item is no an element
-    if (!item.isElem()) {
-        return;
+  // wrap params in an array if not already
+  ['id', 'class'].forEach(function(key) {
+    if (!Array.isArray(params[key])) {
+      params[key] = [ params[key] ];
     }
+  });
 
-    // remove element if it's `id` matches configured `id` params
-    elemId = item.attr('id');
-    if (elemId) {
-        return params.id.indexOf(elemId.value) === -1;
-    }
+  // abort if current item is no an element
+  if (!item.isElem()) {
+    return;
+  }
 
-    // remove element if it's `class` contains any of the configured `class` params
-    elemClass = item.attr('class');
-    if (elemClass) {
-        var hasClassRegex = new RegExp(params.class.join('|'));
-        return !hasClassRegex.test(elemClass.value);
-    }
+  // remove element if it's `id` matches configured `id` params
+  const elemId = item.attr('id');
+  if (elemId && params.id.length !== 0) {
+    return params.id.includes(elemId.value) === false;
+  }
+
+  // remove element if it's `class` contains any of the configured `class` params
+  const elemClass = item.attr('class');
+  if (elemClass && params.class.length !== 0) {
+    const classList = elemClass.value.split(' ');
+    return params.class.some(item => classList.includes(item)) === false;
+  }
 };