Organizing regular expression registry verification notes

Regular expression is a logical formula for string operations. It uses some predefined specific characters and combinations of these specific characters to form a "rule string". This "rule string" is used to express A filtering logic for strings.

Purpose of regular expression

1. Whether the given string conforms to the filtering logic of the regular expression (called " Match");

2. We can get the specific part we want from the string through regular expressions.

The characteristics of regular expressions are

1. Flexibility, logic and functionality are very strong;

2. It can quickly achieve complex control of strings in an extremely simple way;

3. It is relatively obscure for those who are new to it.

Registry verification

1. Get the id

function $(id){
  return document.getElementById(id);
}

2. Verify name

function checkName(){
  //获取值
  var username=$('user').value;
  //判断不能为空
  if(username==''){
    $('s1').innerHTML='用户名不能为空';
    return false;
  }
  //正则表达式
  var reg=/^[a-zA-Z][a-zA-Z0-9]{4,9}$/;
  //检测输入内容是否匹配正则表达式
  if(!reg.test(username)){
    $('s1').innerHTML='用户名必须是5-10位数字或字母组成，开头不能是数字'；
    return false;
  }
  //匹配，返回空
    $('s1').innerHTML='';
    return true;
}

Note: s1 is the judgment prompt content, added after the input box

3.Verify password

function checkPwd(){
  //获得值
    同上…
  //判断不能为空
    同上…
  //正则表达式
  var reg=/^\S{6,}$/;
  //检测输入内容是否匹配正则表达式
  if(reg.test(password)==false){
    $('s2').innerHTML='密码必须是6位以上';
    return false;
  }
  //匹配，返回空
    同上…
}

4.Verify email

function checkEmail(){
  //获得值
    同上…
  //判断不能为空
    同上…
  //正则表达式
  var reg=/^\w+@\w+\.com|cn|net$/;      
  //检测输入内容是否匹配正则表达式
  if(!reg.test(email)){
    $('s3').innerHTML='邮箱不合法';
    return false;
  }
  //匹配，返回空
    同上…
}

5. Verify mobile phone number

function checkTel(){
  //获得值
    同上…
  //判断不能为空
    同上…
  //正则表达式
  var reg=/^1[34578]\d{9}$/;     
  //检测输入内容是否匹配正则表达式
  if(!reg.test(tel)){
    $('s4').innerHTML='手机号码不合法';
    return false;
  }
  //匹配，返回空
    同上…
}

6.Verify ID number

function checkCid(){
  //获得值
    同上…
  //判断不能为空
    同上…
  //正则表达式
  var reg=/^\d{15}$|^\d{17}\d|x$/;     
  //检测输入内容是否匹配正则表达式
  if(!reg.test(cid)){
    $('s5').innerHTML='身份证不合法';
    return false;
  }
  //匹配，返回空
    同上…
}

7. Verify QQ number

function checkQQ(){
  //获得值
    同上…
  //判断不能为空
    同上…
  //正则表达式
  var reg=/^[1-9]\d{7,10}$/;     
  //检测输入内容是否匹配正则表达式
  if(!reg.test(qq)){
    $('s6').innerHTML='QQ必须是8到11数字组成，开头不能是0';
    return false;
      }
  //匹配，返回空
    同上…
}

8. Detect all conditions

function checkAll(){
  if(checkName()&&checkPwd()&&checkEmail()&&checkTel()&&checkCid()&&checkQQ()){
    return true;
  }else{
    return false;
  }
}

Of course, in the later stage, you can use the jQuery Validate verification framework for expression verification, which is more convenient.

The above content is a compilation of regular expression registry verification notes. I hope it can help everyone.

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