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Application of regular expressions in PHP

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This program implements a demo that uses regular expressions to implement login verification

<1>:
<?php 
if(isset($_POST["sub"])){
	$text=$_POST["text"];
	$patten=&#39;^[0-9]*$&#39;;
	if(!preg_match($patten,$text,$x)){
	echo"<script>alert('用户没有输入数字');</script>";
}else{
		if($x<1){
			$y=$x;
			echo "y=".$y."<br>";
		}else if($x<10){
			$y=2*$x-1;
			echo
			 "y=".$y."<br>";
		}else{
			$y=3*$x-11;
			echo "y=".$y."<br>";
		}	
}
?>
<html>
<head>
</head>
<body>
<form method=&#39;post&#39;>
请输入信息:<input type="text"name="text">
<input type="submit"name="sub"value="提交">

</form>
</body>
</html>



<2>:
<html>
<head>
</head>
<body>
<form method=&#39;post&#39;>
注册账号:<input type="text"name="aNum"><br>
登录密码:<input type="password"name="pwd"><br>
重复密码:<input type="password"name="rPwd"><br>
邮箱地址:<input type="text"name="email"><br>
手机号码:<input type="text"name="tel"><br>
<input type="submit"name="sub"value="注册">
<?php 
if(isset($_POST["sub"])){
	$aNum=$_POST["aNum"];
	$pwd=$_POST["pwd"];
	$rPwd=$_POST["rPwd"];
	$email=$_POST["email"];
	$tel=$_POST["tel"];
	$patten1="^\w+(\.[\w-]+)*@[\w-]+(\.[\w-]+)+$";//验证邮箱
	$patten2="[0-9]{11}";//11位数字组成，验证手机号码
	$patten3="[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*"//验证账号
	if(!preg_match($patten3,$aNum)){
		echo"<script>alert('账号格式不对');</script>";
	}else{
		if($pwd.length<6){
			echo"<script>alert('密码格式不对');</script>";
		}else{
			if(!preg_match($patten,$email)){
				echo"<script>alert('email格式不正确');</script>";
			}else{
			if(!preg_match($patten2,$tel)){
				echo"<script>alert('手机号码格式不正确');</script>";
			}else{
				if(strlen($pwd)!=strlen($rPwd)){
					echo"<script>alert('两次密码不一致');</script>";
				}else{
					echo"用户您好!您的账号为:".$aNum.",密码为:".$pwd.",邮箱为:".
					$email.",手机号码为:".$tel;
				}
			}
		}
	}
}	

?>
</form>
</body>
</html>

The above has introduced the application of regular expressions in PHP, including aspects of it. I hope it will be helpful to friends who are interested in PHP tutorials.

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