Validate a Phone Number in Dart

String pattern = r'^(?:[+0][1-9])?[0-9]{10,12}$';
RegExp regExp = new RegExp(patttern);

regExp.hasMatch(value)

• ^ beginning of a string
• (?:[+0][1-9])? optionally match a + or 0 followed by a digit from 1 to 9
• [0-9]{10,12} match 10 to 12 digits
• $ end of the strin