fix(isSlug): fix to disallow spaces (#1338)

* Fix: Space Error in isSlug()

* Added Space Test for isSlug()

Author: asp2809

src/lib/isSlug.js

@@ -1,6 +1,6 @@
 import assertString from './util/assertString';
 
-let charsetRegex = /^[^-_](?!.*?[-_]{2,})([a-z0-9\\-]{1,}).*[^-_]$/;
+let charsetRegex = /^[^\s-_](?!.*?[-_]{2,})([a-z0-9-\\]{1,})[^\s]*[^-_\s]$/;
 
 export default function isSlug(str) {
   assertString(str);

test/validators.js

@@ -8369,6 +8369,7 @@ describe('Validators', () => {
         'not-slug-',
         '_not-slug',
         'not-slug_',
+        'not slug',
       ],
     });
   });