Validate Mobile number using regular expression

Question

I need to validate mobile number. My need:

1. The number may start with +8801 or 8801 or 01
2. The next number can be 1 or 5 or 6 or 7 or

Answer 1

Should be pretty simple:

^(?:\+?88)?01[15-9]\d{8}$

• ^ - From start of the string
• (?:\+?88)? - optional 88, which may begin in +
• 01 - mandatory 01
• [15-9] - "1 or 5 or 6 or 7 or 8 or 9"
• \d{8} - 8 digits
• $ - end of the string

Working example: http://rubular.com/r/BvnSXDOYF8

Update 2020

As BTRC approved 2 new prefixes, 013 for Grameenphone and 014 for Banglalink, updated expression for now:

^(?:\+?88)?01[13-9]\d{8}$