Validation to allow space for phone numbers

i have a validation in my .net textbox where it will take only numbers

but when i put the the phone format like

08开发者_如何学Go0 234234

it will not accept because of a space

how to resolve this ?

could anyone help in regular expression ?

Current expression is this [0-9]+

Simply add space to characters range:

[0-9][0-9 ]*

You can also add start and stop indicators:

^[0-9][0-9 ]*$

EDIT: number must start with digit followed with digits or spaces (zero or more).

You could use

([0-9]+\s*)+

or

(\d+\s*)+

either of which would allow one or more groups of digits followed by optional whitespace

Really, the best way to deal with this is to remove all non-digit characters, then do whatever additional validation you may require, such as the number of digits or whether the number begins with a valid area code/country code, on what's left. That way it doesn't matter whether the number is entered as (assuming US numbers here) 987-654-3210, (987) 654-3210, 987 654 3210, 9876543210, 9 8 7-6.54321 0, or whatever else.

Concentrate on validating what's meaningful in the input (the digits) and not incidental details which really don't matter (how the digits are grouped or formatted).