blocks|key|623609|text|它是一个量词，用来描述有效的重复次数。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|623610|“1*元素”至少需要一个元素。|blockquote|623611|参见RFC+2616第2.1节+-增强BNF：|offset|length|623612|*rule
++++++The+character+"*"+preceding+an+element+indicates+repetition.+The
++++++full+form+is+"<n>*<m>element"+indicating+at+least+<n>+and+at+most
++++++<m>+occurrences+of+element.+Default+values+are+0+and+infinity+so
++++++that+"*(element)"+allows+any+number,+including+zero;+"1*element"
++++++requires+at+least+one;+and+"1*2element"+allows+one+or+two.|code-block|syntax|javascript|623613|entityMap|0|LINK|mutability|MUTABLE|url|https://www.rfc-editor.org/rfc/rfc2616#section-2.1^0|0|0|2|D|0|0|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|W|8|@]|9|@]|A|$]]|$1|E|3|F|5|6|7|X|8|@]|9|@$G|Y|H|Z|1|10]]|A|$]]|$1|I|3|J|5|K|7|11|8|@]|9|@]|A|$L|M]]|$1|N|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|O|$P|$5|Q|R|S|A|$T|U]]]]

Its a quantifier that describes the valid number of repetitions.
<blockquote>
&quot;1*element&quot; requires at least one element.
</blockquote>
See <a href="https://www.rfc-editor.org/rfc/rfc2616#section-2.1" rel="nofollow noreferrer">RFC 2616 section 2.1</a> - Augmented BNF:
<pre><code>*rule
 The character &quot;*&quot; preceding an element indicates repetition. The
 full form is &quot;&lt;n&gt;*&lt;m&gt;element&quot; indicating at least &lt;n&gt; and at most
 &lt;m&gt; occurrences of element. Default values are 0 and infinity so
 that &quot;*(element)&quot; allows any number, including zero; &quot;1*element&quot;
 requires at least one; and &quot;1*2element&quot; allows one or two.
</code></pre>

blocks|key|2874511|text|你引用的规范说：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2874512|此规范使用ABNF+(增广Backus)。
在RFC5234中定义的符号。以下核心规则通过引用(如RFC5234，附录B.1)所定义:阿尔法(字母)，数字(小数点0-9)，十六进制0-9/+and+/and)，以及LWSP
(线性空格)。|blockquote|2874513|到RFC+5234，你会发现https://www.rfc-editor.org/rfc/rfc5234#section-3.6|offset|length|2874514|entityMap|0|LINK|mutability|MUTABLE|url|https://www.rfc-editor.org/rfc/rfc5234#section-3.6^0|0|0|E|1E|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$]]|$1|E|3|F|5|6|7|S|8|@]|9|@$G|T|H|U|1|V]]|A|$]]|$1|I|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P]]]]

The spec you quoted says:
<blockquote>
This specification uses the ABNF (Augmented Backus-Naur Form) 
notation defined in [RFC5234]. The following core rules are included
by reference, as defined in [RFC5234], Appendix B.1: ALPHA (letters),
DIGIT (decimal 0-9), HEXDIG (hexadecimal 0-9/A-F/a-f), and LWSP 
(linear whitespace).
</blockquote>
Go to RFC 5234 and you'll find <a href="https://www.rfc-editor.org/rfc/rfc5234#section-3.6" rel="nofollow noreferrer">https://www.rfc-editor.org/rfc/rfc5234#section-3.6</a>

Quote from <a href="https://www.rfc-editor.org/rfc/rfc5987#section-3.2.1%EF%BC%9A" rel="nofollow noreferrer">https://www.rfc-editor.org/rfc/rfc5987#section-3.2.1：</a>
<blockquote>
In order to include character set and language information, this 
specification modifies the RFC 2616 grammar to be:
<pre><code> parameter = reg-parameter / ext-parameter

 reg-parameter = parmname LWSP &quot;=&quot; LWSP value

 ext-parameter = parmname &quot;*&quot; LWSP &quot;=&quot; LWSP ext-value

 parmname = 1*attr-char

 ext-value = charset &quot;'&quot; [ language ] &quot;'&quot; value-chars
 ; like RFC 2231's &lt;extended-initial-value&gt;
 ; (see [RFC2231], Section 7)

 charset = &quot;UTF-8&quot; / &quot;ISO-8859-1&quot; / mime-charset

 mime-charset = 1*mime-charsetc
</code></pre>
</blockquote>
What does <code>*</code> mean in <code>parmname = 1*attr-char</code>? And also the same question at <code>mime-charset = 1*mime-charsetc</code>.
What I have known is that <code>&quot;*&quot;</code> mean exactly <code>*</code> itself in <code>ext-parameter = parmname &quot;*&quot; LWSP &quot;=&quot; LWSP ext-value</code>, due to the fact that the RFC show an example latter of <code>ext-parameter = parmname &quot;*&quot; LWSP &quot;=&quot; LWSP ext-value</code>:
<blockquote>
title*=iso-8859-1'en'%A3%20rates
</blockquote>

What does "*" (asterisk) mean in RFC?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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来自的报价为了包含字符集和语言信息，规范将RFC 2616语法修改为：参数=reg-参数/ext-参数reg-参数= parmname LWSP "=“LWSP值ext-参数= parmname "*”LWSP "=“LWSP ext-值parmname = 1*attr-char ext-value = charse...

问在RFC中"*“(星号)是什么意思？
EN

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问在RFC中"*“(星号)是什么意思？EN