Notepad ++ - keep numbers only

Question

I have a text file containing numbers and characters (in arabic)

like this:

943894رنيش964737

ترشقة1045051

ضمنزلبالق10653

to this:

Answer 1

use regex replace with this regex: [^\d] and replace with empty string

press ctrl+f
goto replace tab
check regular expressions
put '[^\d]' in search
press 'replace all'

use this regex if you want to keep line breaks: [^\d\r\n]