PHP regular expression collection

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}

    
  
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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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