TextInputFormatter篇

忽略特殊字符

import 'package:flutter/services.dart';
const _regExp=r"^[\u4E00-\u9FA5A-Za-z0-9_]+$";
//忽略特殊字符
class IgnoreOtherFormatter extends TextInputFormatter{
  @override
  TextEditingValue formatEditUpdate(TextEditingValue oldValue, TextEditingValue newValue) {
    if(newValue.text.length>0){
      if(RegExp(_regExp).firstMatch(newValue.text)!=null){
        return newValue;
      }
      return oldValue;
    }
   return newValue;
  }
}

只能输入数字和小写字母

import 'package:flutter/services.dart';
const _regExp=r"^[Za-z0-9_]+$";
class onlyInputNumberAndLowWorkFormatter extends TextInputFormatter{
  @override
  TextEditingValue formatEditUpdate(TextEditingValue oldValue, TextEditingValue newValue) {
    if(newValue.text.length>0){
      if(RegExp(_regExp).firstMatch(newValue.text)!=null){
        return newValue;
      }
      return oldValue;
    }
   return newValue;
  }
}

只能输入数字和字母

import 'package:flutter/services.dart';
const _regExp=r"^[ZA-ZZa-z0-9_]+$";
class onlyInputNumberAndWorkFormatter extends TextInputFormatter{
  @override
  TextEditingValue formatEditUpdate(TextEditingValue oldValue, TextEditingValue newValue) {
    if(newValue.text.length>0){
      if(RegExp(_regExp).firstMatch(newValue.text)!=null){
        return newValue;
      }
      return oldValue;
    }
   return newValue;
  }
}

只能输入数字

WhitelistingTextInputFormatter.digitsOnly

长度限制(限制6位)

LengthLimitingTextInputFormatter(6)

限制单行

BlacklistingTextInputFormatter.singleLineFormatter

正则校验篇

  ///手机号验证
  static bool isChinaPhoneLegal(String str) {
    return RegExp(
            r"^1([38][0-9]|4[579]|5[0-3,5-9]|6[6]|7[0135678]|9[89])\d{8}$")
        .hasMatch(str);
  }

  ///邮箱验证
  static bool isEmail(String str) {
    return RegExp(
        r"^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$")
        .hasMatch(str);
  }