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- String validateUsername(String value) {
- String pattern = r'^(([^<>()[]\.,;:s@"]+(.[^<>()[]\.,;:s@"]+)*)|(".+"))@(([[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}.[0-9]{1,3}])|(([a-zA-Z-0-9]+.)+[a-zA-Z]{2,}))$';
- RegExp regExp = new RegExp(pattern);
- if (value.length == 0) {
- return "Username is Required";
- } else if(!regExp.hasMatch(value)){
- return "Invalid username";
- }else {
- return null;
- }
- TextField(
- inputFormatters: [
- BlacklistingTextInputFormatter(
- new RegExp("[^a-z^A-Z^0-9]+")) //Regex for accepting only alphanumeric characters
- ],
- )
- SELECT * FROM user WHERE user_name = "userName";
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