From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: RegExp.$1-$9
+slug: Web/JavaScript/Reference/Global_Objects/RegExp/n
+translation_of: Web/JavaScript/Reference/Global_Objects/RegExp/n
+---
+<div>{{JSRef}} {{non-standard_header}}</div>
+
+<p>非标准<strong>$1, $2, $3, $4, $5, $6, $7, $8, $9 </strong>属性是包含括号子串匹配的正则表达式的静态和只读属性。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox"><code><var>RegExp</var>.$1
+RegExp.$2</code>
+RegExp.$3
+RegExp.$4
+RegExp.$5
+RegExp.$6
+RegExp.$7
+RegExp.$8
+RegExp.$9
+</pre>
+
+<h2 id="描述">描述</h2>
+
+<p>$1, ..., $9 属性是静态的, 他不是独立的的正则表达式属性. 所以, 我们总是像这样子使用他们<code>RegExp.$1</code>, ..., <code>RegExp.$9</code>.</p>
+
+<p>属性的值是只读的而且只有在正确匹配的情况下才会改变.</p>
+
+<p>括号匹配项是无限的, 但是RegExp对象能捕获的只有九个. 你可以通过返回一个数组索引来取得所有的括号匹配项.</p>
+
+<p>这些属性可以在{{jsxref("String.replace")}} 方法中替换字符串. 在这种情况下, 不用在前面加上RegExp。下面的例子将详细说明. 当正则表达式中不包含括号, 脚本中的 <code>$n</code>'s 就是字面上的意思 (当n是正整数).</p>
+
+<h2 id="例子">例子</h2>
+
+<h3 id="n_在_String.replace中的应用"><code>$n</code> 在 <code>String.replace中的应用</code></h3>
+
+<p>以下脚本用 {{jsxref("String.prototype.replace()", "replace()")}} 方法去匹配一个first last格式的 name{{jsxref("String")}} 实例 输出last first格式. 在替换文本里, 脚本用 <code>$1</code> 和 <code>$2</code> 表示正则表达式中的括号匹配项的结果.</p>
+
+<pre class="brush: js">var re = /(\w+)\s(\w+)/;
+var str = 'John Smith';
+str.replace(re, '$2, $1'); // "Smith, John"
+RegExp.$1; // "John"
+RegExp.$2; // "Smith"
+</pre>
+
+<h2 id="技术指标">技术指标</h2>
+
+<p>非标准. 不属于当前的任何规范.</p>
+
+<h2 id="浏览器适配">浏览器适配</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Chrome for Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>{{non-standard_inline}} {{jsxref("RegExp.input", "RegExp.input ($_)")}}</li>
+ <li>{{non-standard_inline}} {{jsxref("RegExp.lastMatch", "RegExp.lastMatch ($&amp;)")}}</li>
+ <li>{{non-standard_inline}} {{jsxref("RegExp.lastParen", "RegExp.lastParen ($+)")}}</li>
+ <li>{{non-standard_inline}} {{jsxref("RegExp.leftContext", "RegExp.leftContext ($`)")}}</li>
+ <li>{{non-standard_inline}} {{jsxref("RegExp.rightContext", "RegExp.rightContext ($')")}}</li>
+</ul>
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