Flutter - Validate a phone number using Regex
Validation using Regex:
String validateMobile(String value) { String pattern = r'(^(?:[+0]9)?[0-9]{10,12}$)'; RegExp regExp = new RegExp(pattern); if (value.length == 0) { return 'Please enter mobile number'; } else if (!regExp.hasMatch(value)) { return 'Please enter valid mobile number'; } return null;}
I used the RegExp provided by @Dharmesh
This is how you can do it with null safety.
bool isPhoneNoValid(String? phoneNo) { if (phoneNo == null) return false; final regExp = RegExp(r'(^(?:[+0]9)?[0-9]{10,12}$)'); return regExp.hasMatch(phoneNo);}Usage:
bool isValid = isPhoneNoValid('your_phone_no');