Regular matching starts with XXX and ends with XXX

Catalog

Preface

One 、 What is regular matching ？

Two 、 Regular matching grammar practice

1、 Full string match

 2、 matching XXX Start 、XXX end 、XXX

summary

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Preface

Regular matching is an expression that describes a certain rule , It can greatly improve the efficiency of string extraction and string matching .

 

One 、 What is regular matching ？

Regular expressions （ English ：Regular Expression, Often abbreviated to regex、regexp or RE）, Also known as regular expression 、 Regular representation 、 Regular expressions 、 Conventional representation is a concept of Computer Science . Regular expressions are described using a single string 、 Match a string that matches a syntax rule . such as Linux In the system Grep command  

Two 、 Regular matching grammar practice

1、 Full string match

Full string matching is a prime regular expression , It is a simple search function , Such as query was,test These English only once .

 Regular expressions ：was

 2、 matching XXX Start 、XXX end 、XXX

In the syntax of regular expressions ^ At the beginning , This indicates that XXX To start with , The following example is matching with sh As the beginning word ~

 Regular expressions ：^sh

  In the syntax of regular expressions $ The end of the , This indicates that XXX To start with , The following example is matching with lls As a closing word ~

 Regular expressions ：lls$

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summary

Today, we briefly introduce the regular matching with XXX Start with XXX The grammar of the end , Later, we will find some highlights to analyze in detail .

Last, last , Put a little regular expression benefit ：

Remove the left and right blanks : str.replace(/(^\s*)|(\s*$)/g, '')

Remove all the blanks : str.replace(/\s+/g, '')

The password needs to be by 8 Upper capital letters 、 Lowercase letters 、 Numbers and special symbols : /^(?=.*?[A-Z])(?=.*?[a-z])(?=.*?[0-9])(?=.*?[#?!.,@$%^&*-]).{8,}$/

Email Address ：^w+([-+.]w+)*@w+([-.]w+)*.w+([-.]w+)*$

domain name ：[a-zA-Z0-9][-a-zA-Z0-9]{0,62}(/.[a-zA-Z0-9][-a-zA-Z0-9]{0,62})+/.?

InternetURL：[a-zA-z]+://[^s]* or ^http://([w-]+.)+[w-]+(/[w-./?%&=]*)?$`

Phone number ：^(13[0-9]|14[5|7]|15[0|1|2|3|5|6|7|8|9]|18[0|1|2|3|5|6|7|8|9])d{8}$

Phone number (“XXX-XXXXXXX”、”XXXX-XXXXXXXX”、”XXX-XXXXXXX”、”XXX-XXXXXXXX”、”XXXXXXX” and ”XXXXXXXX)：^((d{3,4}-)|d{3.4}-)?d{7,8}$

Domestic phone number (0511-4405222、021-87888822)：d{3}-d{8}|d{4}-d{7}

ID number (15 position 、18 Digit number )：^d{15}|d{18}$

Short ID number ( Numbers 、 Letter x ending )：^([0-9]){7,18}(x|X)?$ or ^d{8,18}|[0-9x]{8,18}|[0-9X]{8,18}?$

Is the account number legal ( Beginning of letter , allow 5-16 byte , Allow alphanumeric underscores )：^[a-zA-Z][a-zA-Z0-9_]{4,15}$

password ( Start with a letter , The length is in 6~18 Between , Can only contain letters 、 Numbers and underscores )：^[a-zA-Z]w{5,17}$

Strong password ( Must contain a combination of upper and lower case letters and numbers , Special characters cannot be used , The length is in 8-10 Between )：^(?=.*d)(?=.*[a-z])(?=.*[A-Z]).{8,10}$

Date format ：^d{4}-d{1,2}-d{1,2}

One year 12 Months (01～09 and 1～12)：^(0?[1-9]|1[0-2])$

A month 31 God (01～09 and 1～31)：^((0?[1-9])|((1|2)[0-9])|30|31)$ xml file ：^([a-zA-Z]+-?)+[a-zA-Z0-9]+\.[x|X][m|M][l|L]$

Regular expression for blank lines ：s* ( Can be used to delete blank lines )

HTML Tagged regular expression ：<(S*?)[`^>]*>.*?</>|<.*? /> ( The version circulating on the Internet is too bad , This one is only part of it , There's nothing we can do about complex nested tags )

Regular expression of first and last whitespace characters ：^s*|s*$ or (^s*)|(s*$) ( Can be used to delete blank characters at the beginning and end of a line ( Including Spaces 、 tabs 、 Page breaks and so on ), Very useful expressions )

tencent QQ Number ：[1-9][0-9]{4,} ( tencent QQ Number from 10000 Start )

China Post Code ：[1-9]d{5}(?!d) ( China Post code is 6 Digit number )

IP Address ：((?:(?:25[0-5]|2[0-4]\d|[01]?\d?\d)\.){3}(?:25[0-5]|2[0-4]\d|[01]?\d?\d))