Add slug validation utility function

app/util/validate_slug.py

@@ -0,0 +1,14 @@
+import re
+
+
+def validate_slug(slug):
+    """
+    Validates a slug.
+    :param slug: The slug to validate.
+    :type slug: str
+    :return: True if the slug is valid, False otherwise.
+    :rtype: bool
+
+
+    """
+    return re.match(r'^[a-z0-9_-]{3,60}$', slug) is not None