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Flutter - Validate a phone number using Regex

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asked 13-09-2021

2 Answers


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first part optional matching either a + or 0 followed by a 9. Then match 10 digits:

^(?:[+0]9)?[0-9]{10}$

^ Start of string

(?:[+0]9)? Optionally match a + or 0 followed by 9

[0-9]{10} Match 10 digits

$ End of string

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answered 14-09-2021

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Validation using Regex:

String validateMobile(String value) {
    String pattern = r'(^(?:[+0]9)?[0-9]{10,12}$)';
    RegExp regExp = new RegExp(pattern);
    if (value.length == 0) {
          return 'Please enter mobile number';
    }
    else if (!regExp.hasMatch(value)) {
      return 'Please enter valid mobile number';
    }
    return null;
}   
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answered 14-09-2021