TextInputFormatter篇

1.忽略特殊字符

import 'package:flutter/services.dart';
class IgnoreOtherFormatter extends TextInputFormatter{
  var _regExp=r"^[\u4E00-\u9FA5A-Za-z0-9_]+$";

  @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;
  }
}

2.只能輸入數(shù)字和小寫字母

import 'package:flutter/services.dart';
class OnlyInputNumberAndLowWorkFormatter extends TextInputFormatter{
  var _regExp=r"^[a-z0-9_]+$";
  @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;
  }
}

3.只能輸入數(shù)字和字母

import 'package:flutter/services.dart';
class OnlyInputNumberAndWorkFormatter extends TextInputFormatter{
  var _regExp=r"^[A-Za-z0-9_]+$";
  @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;
  }
}

4.忽略表情

RegExp regexp=RegExp("[^\\u0020-\\u007E\\u00A0-\\u00BE\\u2E80-\\uA4CF\\uF900-\\uFAFF\\uFE30-\\uFE4F\\uFF00-\\uFFEF\\u0080-\\u009F\\u2000-\\u201f\r\n]");
inputFormatters.add(BlacklistingTextInputFormatter(regexp));

4.只能輸入數(shù)字

WhitelistingTextInputFormatter.digitsOnly

5.長度限制(限制6位)

LengthLimitingTextInputFormatter(6)

6.限制單行

BlacklistingTextInputFormatter.singleLineFormatter

7.輸入價錢

FilteringTextInputFormatter.allow(RegExp(r'^\d+(\.)?(\d+)?'))

8.輸入最多兩位小數(shù)的價錢

FilteringTextInputFormatter.allow(RegExp(r'^\d+(\.)?[0-9]{0,2}'))

正則校驗篇

  ///手機(jī)號驗證
  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);
  }

  ///郵箱驗證
  static bool isEmail(String str) {
    return RegExp(
        r"^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$")
        .hasMatch(str);
  }
///驗證URL
  static bool isUrl(String value) {
    return RegExp(
        r"^((https|http|ftp|rtsp|mms)?:\/\/)[^\s]+")
      .hasMatch(value);
}

///驗證身份證
  static bool isIdCard(String value) {
    return RegExp(
        r"\d{17}[\d|x]|\d{15}")
      .hasMatch(value);
}

///驗證中文
  static bool isChinese(String value) {
    return RegExp(
       r"[\u4e00-\u9fa5]")
      .hasMatch(value);
}

  // 驗證是否為純字母
  static bool isLetter(String str) {
    final reg = RegExp(r"^[ZA-ZZa-z_]+$");
    return reg.hasMatch(str);
  }

  // 驗證是否為數(shù)字
  static bool isNumber(String str) {
    final reg = RegExp(r"^[0-9_]+$");
    return reg.hasMatch(str);
  }

  //驗證是否包含特殊字符
  static bool isHaveSpecialCharacters(String input) {
    final reg = new RegExp(r'[`~!@#$%^&*()_+=|;:(){}'',\\[\\].<>/?~！@#￥%……&*（）——+|{}【】‘；：”“’。，、？-]');
    return reg.hasMatch(input);
  }