Regular expressions (regular matching)

Regular expressions

A regular expression consists of two parts
atom （ Match content ）+ Metacharacters （ Number of matches ）

atom ：

Metacharacters ：

The most important thing is ** practice ** 了 , You can take a look at the following commonly used , You can also go to the rookie tutorial to see other

This time I'll show you some of these functions （ Applications in life ）：
Regular matching mailbox number
Regular matching phone number
Match URL
Verify that the real name is Chinese characters
Hide numbers in mobile numbers
String split into arrays

<?php
// Simple regular matching ： atom + Metacharacters 
$a="[email protected]_q.cm";
$b="19139567866";
$c="https://www.baidu.com";
$d=" Zhang San ";
$check2=preg_match("/^\[email protected]\w+\.[0-9a-zA-Z]{2,4}$/",$a);// Regular matching mailbox number 
$check1=preg_match("/^1[0-9]{10}$/",$b);// Regular matching mailbox number 
$check3=preg_match("/^https?:\/\/\w+\.\w+/",$c);// Match URL , The last Terminator $ To get rid of   Can also be written as "/^(http)|(https):\/\/\w+\.\w+/"
$check4=preg_match("/^[^u4E00-u9FA5]{4,10}$/",$d);// Verify that the real name must be in Chinese characters , One Chinese character has two lengths ,[4,10] Express 2-5 A word 
echo $check5=preg_replace("/[123]/","*",$b,2);// Hide numbers in mobile numbers ,2 Indicates that only two numbers are hidden 
echo"<br>";
$check6=" Zhang San , Li Si , Wang Wu # Old six ";// String split into arrays 
$arry1=explode(",",$check6);
$arry2=preg_split("/[#,]/",$check6);
print_r($arry1);
echo "<br>";
print_r($arry2);
if($check1&&$check2&&$check3&&$check4)
{
    echo('<br>zq');}
else{
    echo("cuowu");}