电话号码的ASP.Net验证表达式

Question

I need a Validation Expression to validate an Egyptian mobile number as an input in my form.

Egyptian Mobile Number:

• must Contain 11 Digits
• must Begin with '01'
• the third digit must be either '2' or '1' or '0'

Answer 1

Do you need to support starting '+' characters, spaces or '-' signs inside your phone number? If you don't and you need to support just exact what you said then you can use this pattern:

"^01[0-2][0-9]{8}$"