Category：Regular Expression
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Time：2020-7-11
In computer science, it refers to a single string used to describe or match a series of strings that conform to a certain syntactic rule. In many text editors or other tools, regular expressions are often used to retrieve and / or replace text content that conforms to a certain pattern. Many programming languages support […]
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Time：2020-7-10
In computer science, it refers to a single string used to describe or match a series of strings that conform to a certain syntactic rule. In many text editors or other tools, regular expressions are often used to retrieve and / or replace text content that conforms to a certain pattern. Many programming languages support […]
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Time：2020-7-8
Remove the first space Copy codeThe code is as follows: str=str.replace(/^\s+|\s+$/g,”);
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Time：2020-7-7
tppabs The tppabs tag in HTML original file is the tag left by teleport Pro software. The software is an offline browser. After downloading a complete web page, it will insert tppabs tag into the image or hyperlink tag to record the original address pointed to by the image or hyperlink. Because this tag is […]
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Time：2020-7-7
Definition and Usage The replace() method is used to replace some characters in a string with others, or a substring that matches a regular expression. grammar stringObject.replace(regexp,replacement) Parameter descriptionRegexp required. Regexp object that specifies the schema to be replaced. Note that if the value is a string, it is treated as a literal pattern to […]
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Time：2020-7-1
In the development of registration system, it is necessary to detect whether the email address entered by the user is legal. It can be detected in JS or PHP, but the difference is not big. Regular expression can be used to detect. Here is an example of JS: Copy codeThe code is as follows: function […]
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Time：2020-6-30
First of all, let’s talk about my needs I want to make a request for the format of the input in a text box Content must be “String”“String” + “/” + “string”“String” + “/” + “string” + “/” + “string”“String” + “/” + “string” + “/” + “string” + “/” + “string”。。。 There is no […]
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Time：2020-6-29
Often dealing with pictures, we have to use some attributes such as SCR, alt, title and so on. Here we summarize some commonly used ones, which are not bad, more general!PHP regular expression matching any attribute PHP in img Copy codeThe code is as follows: <?php /*Extracting any regular attribute from PHP img*/$STR = ‘< […]
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Time：2020-6-28
Article positioning (target readers) People who have heard of regular expressions and have seen their use, but have not mastered them• someone who has seen at least one 30 minute introduction to regular expressions but has not fully mastered it. What is regular expression Regular expression is a concept, a syntax and syntactic convention. Each […]
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Time：2020-6-27
The data that need to be processed by our program is not always designed with database thinking in advance, or can not be stored with database structure.For example, template engine parsing template, garbage sensitive information filtering and so on.In general, we use regular to match preg according to our rules_ Match, replace preg_ replace。But in […]
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Time：2020-6-25
Recently, I met a requirement to pass in a string and insert a space every three characters For example: Incoming abcd1234 Output ABC D12 34 After thinking about it, I’m going to write a function as follows Copy codeThe code is as follows: function appendSpace(s) { var length = s.length; var result = “”; var […]
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Time：2020-6-24
The effect of implementation: in the string abcdefgname =’test’sdfhshshshjsfsjdfps, get the value test of name Implementation mechanism: obtained through the callback function of replace. code: Copy codeThe code is as follows: var str = “abcdefgname=’test’sddfhskshjsfsjdfps”; var reg = /name='((\w|-|\s)+)/ig; str.replace(reg, function() { console.log(arguments.length); //5 console.log(arguments[1]);//test }); Note: replace has five callback functions. PS: About regularity, […]
