regex for only numbers in string?

Question

I can\'t find the regex for strings containing only whitespaces or integers. The string is an input from user on keyboard. It can contain everything but \\n (bu

Answer 1

How about something like this

^ *\d[\d ]*$

See demo at regex101

The pattern requires at least one digit to be contained.

Answer 2

>>> re.match(r'^([\s\d]+)$', text)

You need to put start (^) and end of line ($) characters in. Otherwise, the part of the string with the characters in will match, resulting in false positive matches

Answer 3

To match only a whitespace or a digit you could use:

^[ 0-9]+$

That would match from the beginning of the string ^ one or more whitespaces or a digit using a character class [ 0-9]+ until the end of the string $.