diff --git a/django/core/validators.py b/django/core/validators.py
index 34c397506f..1a714c5472 100644
--- a/django/core/validators.py
+++ b/django/core/validators.py
@@ -99,7 +99,7 @@ email_re = re.compile(
     r'|\[(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}\]$', re.IGNORECASE)  # literal form, ipv4 address (SMTP 4.1.3)
 validate_email = EmailValidator(email_re, _('Enter a valid e-mail address.'), 'invalid')
 
-slug_re = re.compile(r'^[-\w]+$')
+slug_re = re.compile(r'^[-a-zA-Z0-9_]+$')
 validate_slug = RegexValidator(slug_re, _("Enter a valid 'slug' consisting of letters, numbers, underscores or hyphens."), 'invalid')
 
 ipv4_re = re.compile(r'^(25[0-5]|2[0-4]\d|[0-1]?\d?\d)(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}$')