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Regular replacement of html

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May 21, 2023 pm 05:54 PM

<p>Regular expressions are often used in daily code processing, and one of the common applications is to replace strings. In web development, we often need to replace some HTML tags or specific characters. So how do regular expressions achieve such a function? Let's introduce how to use regular expressions for HTML replacement. </p> <ol><li>What is a regular expression?</li></ol> <p>Regular Expression is a method of matching and searching strings and symbol sequences. model. In layman's terms, a regular expression is a rule that defines a pattern of strings. Regular expressions are not a programming language, but a set of rules invented by computer scientists and are now widely used in various programming languages. In JavaScript, we can use RegExp objects to represent regular expressions. </p> <ol start="2"><li>HTML Replacement Example</li></ol> <p>Now there is an HTML string that contains some unnecessary tags, and these tags need to be replaced. We can use regular expressions to accomplish this task. The following is an example: </p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>HTML替换实例</title> </head> <body> <div class="content"> <p>这是一段需要替换的HTML字符串，<span>其中包含一些需要被替换的标签</span>，比如<strong>这个标签</strong>，还有<a href="#">这个标签</a>，需要转化成纯文本格式。</p> </div> </body> </html></pre><div class="contentsignin">Copy after login</div></div><p> Now you need to replace all the HTML tags in this page with plain text. You can use the following regular expression: </p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>/<(?:.|\n)*?>/gm</pre><div class="contentsignin">Copy after login</div></div><p> Among them, <code><</code> and <code>></code> represent the start and end marks of the tag, <code>(?:.|\n)*?</code> means matching 0 or more non-newline characters, where <code> (?:)</code> means not to capture the content of the group, <code>gm</code> is the modifier of the regular expression, <code>g</code> means global matching, <code>m</code> means multiple lines match. </p><p>Use JavaScript code to replace: </p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>var htmlStr = '<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8"><title>HTML替换实例</title></head><body><div class="content"><p>这是一段需要替换的HTML字符串，<span>其中包含一些需要被替换的标签</span>，比如<strong>这个标签</strong>，还有<a href="#">这个标签</a>，需要转化成纯文本格式。</p></div></body></html>'; var pureText = htmlStr.replace(/<(?:.|\n)*?>/gm, ''); console.log(pureText);</pre><div class="contentsignin">Copy after login</div></div><p>The running result is: </p><div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'>HTML替换实例这是一段需要替换的HTML字符串，其中包含一些需要被替换的标签，比如这个标签，还有这个标签，需要转化成纯文本格式。</pre><div class="contentsignin">Copy after login</div></div><p>As you can see, all HTML tags have been replaced with plain text. </p> <ol start="3"><li>Summary</li></ol> <p>In website development, using regular expressions for HTML replacement is a common requirement. Use regular expressions to replace strings quickly and efficiently. It should be noted that the symbols and modifiers in regular expressions may be different and need to be determined according to specific needs. </p>

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