Regular Expression Arabic characters and numbers only
Just add 1-9 (in Unicode format) to your character-class:
^[\u0621-\u064A0-9 ]+$
OR add \u0660-\u0669 to the character-class which is the range of Arabic numbers :
^[\u0621-\u064A\u0660-\u0669 ]+$
You can use:
^[\u0621-\u064A\s\p{N}]+$
\p{N} will match any unicode numeric digit.
To match only ASCII digit use:
^[\u0621-\u064A\s0-9]+$
EDIT: Better to use this regex:
^[\p{Arabic}\s\p{N}]+$
RegEx Demo