Organizing regular expression registry verification notes-PHP Tutorial-php.cn

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); }

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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; }

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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… }

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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… }

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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… }

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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… }

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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… }

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8. Detect all conditions

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

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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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