I want to validate a phone number using regexp in flutter with 11 digit and should always start with-CodePudding

I am working with regexp in dart for my flutter project. the digit should be 11 digits and the first 2 digits should always start with 09 and the remaining 9 digits can be any numbers.

RegExp regExp = new RegExp(
      r"(0/91)?[7-9][0-9]{9}");
        
        if (regExp.hasMatch("09123979064")) {
            print("valid");
        } else {
            print("invalid phone number");
        }

CodePudding user response：

The (0/91)?[7-9][0-9]{9} regex matches an optional 0/91 substring capturing it into Group 1 and then matches 7, 8 or 9 digit, and then nine more digits anywhere inside the string.

You need

RegExp regExp = new RegExp("^09[0-9]{9}$");

where

^ - start of string
09 - a 09 substring
[0-9]{9} - nine digits
$ - end of string.

See the regex demo.