diff --git a/client/src/app/shared/forms/form-validators/user-validators.service.ts b/client/src/app/shared/forms/form-validators/user-validators.service.ts
index 66543657a..b1c61d6df 100644
--- a/client/src/app/shared/forms/form-validators/user-validators.service.ts
+++ b/client/src/app/shared/forms/form-validators/user-validators.service.ts
@@ -25,13 +25,13 @@ export class UserValidatorsService {
         Validators.required,
         Validators.minLength(1),
         Validators.maxLength(50),
-        Validators.pattern(/^[a-z0-9][a-z0-9-._]*$/)
+        Validators.pattern(/^[a-z0-9][a-z0-9._]*$/)
       ],
       MESSAGES: {
         'required': this.i18n('Username is required.'),
         'minlength': this.i18n('Username must be at least 1 character long.'),
         'maxlength': this.i18n('Username cannot be more than 50 characters long.'),
-        'pattern': this.i18n('Username should be lowercase alphanumeric; dots, dashes and underscores are allowed.')
+        'pattern': this.i18n('Username should be lowercase alphanumeric; underscores are allowed.')
       }
     }
 
diff --git a/client/src/app/shared/forms/form-validators/video-channel-validators.service.ts b/client/src/app/shared/forms/form-validators/video-channel-validators.service.ts
index 7df4f6adf..e657f36cf 100644
--- a/client/src/app/shared/forms/form-validators/video-channel-validators.service.ts
+++ b/client/src/app/shared/forms/form-validators/video-channel-validators.service.ts
@@ -16,13 +16,13 @@ export class VideoChannelValidatorsService {
         Validators.required,
         Validators.minLength(1),
         Validators.maxLength(50),
-        Validators.pattern(/^[a-z0-9][a-z0-9-._]*$/)
+        Validators.pattern(/^[a-z0-9][a-z0-9._]*$/)
       ],
       MESSAGES: {
         'required': this.i18n('Name is required.'),
         'minlength': this.i18n('Name must be at least 1 character long.'),
         'maxlength': this.i18n('Name cannot be more than 50 characters long.'),
-        'pattern': this.i18n('Name should be lowercase alphanumeric; dots, dashes and underscores are allowed.')
+        'pattern': this.i18n('Name should be lowercase alphanumeric; underscores are allowed.')
       }
     }