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PHP regular expression collection

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Release： 2023-03-17 15:04:01

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Regular expression, also known as regular expression, is called Regular Expression in English. It is often abbreviated as regex, regexp or RE in the code. It is a concept in computer science. Regular tables are usually used to retrieve and replace text that matches a certain pattern (rule). A regular expression is a logical formula that operates on strings (including ordinary characters (for example, letters between a to z) and special characters (called "metacharacters")), which uses some predefined specific characters. , and the combination of these specific characters form a "rule string". This "rule string" is used to express a filtering logic for strings. A regular expression is a text pattern that describes one or more strings to match when searching for text.

The following is a collection of some commonly used regular expressions:

Only numbers can be entered: "^[0-9]*$"

Only n digits can be entered Numbers: "^\d{n}$"

Only numbers with at least n digits can be entered: "^\d{n,}$"

Only m ~ n digits can be entered Numbers: "^\d{m,n}$"

Only numbers starting with zero and non-zero can be entered: "^(0|[1-9][0-9]*)$"

You can only enter positive real numbers with two decimal places: "^[0-9]+(.[0-9]{2})?$"

You can only enter 1 ~Positive real numbers with 3 decimal places: "^[0-9]+(.[0-9]{1,3})?$"

Only non-zero positive integers can be entered: "^\ +?[1-9][0-9]*$"

Only non-zero negative integers can be entered: "^\-[1-9][0-9]*$"

Only characters with a length of 3 digits can be entered: "^.{3}$"

Only a string of 26 English letters can be entered: "^[A-Za-z]+$ "

Only a string consisting of 26 uppercase English letters can be entered: "^[A-Z]+$"

Only a string consisting of 26 lowercase English letters can be entered:" ^[a-z]+$"

You can only enter a string consisting of numbers and 26 English letters: "^[A-Za-z0-9]+$"

Only Enter a string consisting of numbers, 26 English letters or underscores: "^\w+$"

Verify user password: "^[a-zA-Z]\w{5,17}$" Correct Format bit: starts with a letter, has a length between 6 and 18, and can only contain characters, numbers and underscores

Verify whether it contains illegal characters ^(?:[\u4e00-\u9fa5]*\w*\ s*)+$

Only Chinese characters can be entered: "^[\u4e00-\u9fa5]{0,}$"

Verify email address: "^\w+([-+. ]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$"

Verify InternetURL:"^http://([\ w-]+\.)+[\w-]+(/[\w- ./?%&=]*)?$"

China Phone Number Verification

Matching Form Such as: 0511-4405222 or 021-87888822 or 021-44055520-555 or (0511)4405222

Regular expression "((d{3,4})|d{3,4}-)?d {7,8}(-d{3})*"

China Postal Code Verification

Matching format such as: 215421

Regular expression "d{6}"

Email verification

The matching form is: justali@justdn.com

Regular expression "w+([-+.]w+)*@w+([-. ]w+)*.w+([-.]w+)*"

ID card verification

Matching format such as: 15-digit or 18-digit ID card

Regular expression "d{18}|d{15}"

Commonly used number verification

Regular expression

"d{n}" n is the specified length

"d{n,m}" The length range from n to m

Illegal character verification

Match characters that exclude illegal characters such as:

Regular expression^(? :[\u4e00-\u9fa5]*\w*\s*)+$

Date verification

The matching format is: 20030718,030718

Range: 1900-- 2099

Regular expression ((((19){1}|(20){1})d{2})|d{2})[01]{1}d{1}[0 -3]{1}d{1}

<html>
<head>
<title>php正则表达式集锦实例</title>
<script language="javascript" type="text/javascript">
function Button1_onclick(){
if(!test_hanzi(document.form1.Text1.value)){
alert("姓名只能是汉字");
return false;
}
return true;
}
//验证电子邮件
function test_email(strEmail){ 
var myReg = /^[_a-z0-9]+@([_a-z0-9]+\.)+[a-z0-9]{2,3}$/;
if(myReg.test(strEmail)) return true;
return false;
} 
//只能输入数字
function test_shuzi(strshuzi){ 
var myReg =/^[0-9]*$/;
if(myReg.test(strshuzi)) return true;
return false;
} 
//只能输入汉字
function test_hanzi(strhanzi){ 
var myReg =/^[\u4e00-\u9fa5]{0,}$/;
if(myReg.test(strhanzi)) return true;
return false;
}
</script>
</head>
<body>
<form name="form1">姓名:
    <input id="Text1" name="Text1" type="text" />
    <input name="按钮" type="button" id="Button1" onclick="return Button1_onclick()" value="button" language="javascript" />
</form>
</body>
</html>

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The above is a collection of PHP expressions. I hope it is helpful to everyone and can be used in future work.

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