Tag：regular expression
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Implementation example of golang crawler and regular expression
catalogue character Quantity limit other Reptile Supplement: regular expression plus golang crawler crawling classic case watercress top250 Recently, I learned go, crawled website data and used regular expressions to make a summary; The regular expression in go uses re2 syntax (we don’t know what it is); character . — match any character e.g: abc Results: […]
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Some miscellaneous about Perl regular expressions
$can also match \ n See Introduction to perl language, page 132, note 6 1 /^.*$/ Can you match “\ n”? Yes! Because $can match not only the end of the line, but also \ n2 /^.*$/ Can you match “B \ n”? Yes Can B match \N Match$3 /^.*$/ Can you match “\ NB”? […]
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Give an example to explain the regular expressions in ruby
regular expression Is a special character sequence that can help match or find other strings or strings. The pattern used maintains a special syntax. Regular expression text is a slash between patterns or any separator%r as follows:Syntax: Copy codeThe code is as follows: /pattern/ /pattern/im # option can be specified %r!/usr/local! # general delimited […]
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Regular expression (I)
Regular expression is regular expression. It seems that English is much better than Chinese in understanding. It is to check the expression symbolNot in accordance with the regulations!! Regular expressions have a very powerful and complex object, regexp, in JavaScript 1 Version 2 inAvailable on.Let’s take a look at the introduction of regular expressions:Regular expression […]
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Regular expression (II)
Regular expression specification (II) The following are not new objects of regular expressions. Please refer to the properties of the corresponding JavaScript object$_ Attribute reference input $* attributeReference multiline $& attribute reference lastmatch $+ attribute reference lastparen $` attributeReference leftcontext $’attribute reference rightcontext compile method compile regular expression object during script runningMethods belonging to regexp […]
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PHP regular matches the custom attribute values in the IMG tag
PHP regular matches the custom attribute values in the IMG tag Replaces the original string regular match with the specified string type Such as the following string: $STR = “< p > Zhang San goes to dinner and drinks < / P > < p > < img SRC = \” https://www.baidu.com/Uploads/temp/2202151602455277.png \” data-id=\”2458\” data-path=\”/temp/2202151602455277. […]
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In ASP, regular expression objects are used to verify the legitimacy of data
When we make websites, especially various e-commerce websites, we will first let users fill in some forms to obtain various information of registered users, because users may input all kinds of information, and some unqualified data will bring unnecessary trouble to our back-end ASP processing program, and even lead to some security problems in the […]
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[project practice] implementation of login and registration business (front end + back end + database)
This example is based on Vue JS and mint UI implementation. catalogue 1、 Creation of database 2、 Connection between back-end interface and database 3、 Front end code implementation 1. Relevant codes of registration page 2. Effect of registration page 3. Relevant codes of login page 4. Landing page effect 4、 Registration login demo 5、 Project […]
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Golang regularly matches IP domain names and removes duplicates
The work needs to use golang to use regular matching to match the IP or domain name in the document or field, remove the duplicate and return the slice Write a small method and record it IP regularization [[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3}\.[[:digit:]]{1,3} Domain name regularity [a-zA-Z0-9][-a-zA-Z0-9]{0,62}(\.[a-zA-Z0-9][-a-zA-Z]{0,62})\.? Golang implementation //Match IP fields in document func RegexpIp(str string) []string { […]
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Have you learned how to store web page JSON format data in the process of Python web crawler?
Click above“Python crawler and data mining”, pay attention Reply“book”You can receive a total of 10 e-books from introduction to advanced python this day chicken soup Eight foot dragon beard square brocade mattress, when the weather is cold. Hello, I’m an advanced Python player. 1、 Foreword A few days ago, a fan named [RR] in Python […]
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Introduction to the use of c# regular expressions
In order to avoid this situation in the future, some basic usage methods of regular expressions are recorded here, with small examples. So that you can know his use at a glance in the future, save time for development, and share it with you at the same time Regular metacharacter Before we talk about regular […]
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Use use re debug to view the matching process of regular expressions
Copy codeThe code is as follows: #!/usr/bin/perl use strict; use warnings; use re ‘debug’; sub test { my $str = “123456789”; print join(“:”, split /(?<=…)/, $str); } test();