fix(string utils): do not escape possible regular expressions

test/api/unit/libs/stringUtils.test.js

@@ -0,0 +1,12 @@
+import { getMatchesByWordArray } from '../../../../website/server/libs/stringUtils';
+import bannedWords from '../../../../website/server/libs/bannedWords';
+
+describe('stringUtils', () => {
+  describe('getMatchesByWordArray', () => {
+    it('check all banned words are matched', async () => {
+      const message = bannedWords.join(',');
+      const matches = getMatchesByWordArray(message, bannedWords);
+      expect(matches.length).to.equal(bannedWords.length);
+    });
+  });
+});