1 files changed, 3 insertions, 1 deletions

diff --git a/client/src/app/shared/form-validators/user-validators.ts b/client/src/app/shared/form-validators/user-validators.ts
index fee37e95f..976c97b87 100644
--- a/client/src/app/shared/form-validators/user-validators.ts
+++ b/client/src/app/shared/form-validators/user-validators.ts
@@ -1,12 +1,14 @@
 import { Validators } from '@angular/forms'
 import { BuildFormValidator } from './form-validator.model'
 
+export const USER_USERNAME_REGEX_CHARACTERS = '[a-z0-9][a-z0-9._]'
+
 export const USER_USERNAME_VALIDATOR: BuildFormValidator = {
   VALIDATORS: [
     Validators.required,
     Validators.minLength(1),
     Validators.maxLength(50),
-    Validators.pattern(/^[a-z0-9][a-z0-9._]*$/)
+    Validators.pattern(new RegExp(`^${USER_USERNAME_REGEX_CHARACTERS}*$`))
   ],
   MESSAGES: {
     'required': $localize`Username is required.`,