vb.net - 如何去掉字符串中的所有 alpha 值？

Question

Dim phoneNumber As String = "077 47578 587(num)"

如何将上面的字符串去掉每个不是数字的字符。那么只剩下数字然后检查以确保它的长度是11个字符？

Answer 1

dim number as string = Regex.Replace(phoneNumber,"[^0-9]","")

if number.length = 11 then
 'valid number
else
 'not valid
end if