blocks|key|1674759|text|%5E字符串的开头|type|unordered-list-item|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1674760|[A-Z]{3}一个字符从A到Z重复3次|1674761|-字符-|1674762|[4-7]从4到7的数字|1674763|\d{2,4}任何数字从0到9重复2到4次|1674764|\$字符$|1674765|$字符串的末尾|1674766|unstyled|entityMap^0|0|1|0|0|8|0|0|1|3|1|0|0|5|0|0|7|0|0|2|4|1|0|0|1|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|X|8|@$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]]|D|@]|E|$]]|$1|J|3|K|5|6|7|15|8|@$9|16|A|17|B|C]]|D|@]|E|$]]|$1|L|3|M|5|6|7|18|8|@$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|N|3|O|5|6|7|1B|8|@$9|1C|A|1D|B|C]|$9|1E|A|1F|B|C]]|D|@]|E|$]]|$1|P|3|Q|5|6|7|1G|8|@$9|1H|A|1I|B|C]]|D|@]|E|$]]|$1|R|3|-4|5|S|7|1J|8|@]|D|@]|E|$]]]|T|$]]

<ul>
<li><code>^</code> the start of the string</li>
<li><code>[A-Z]{3}</code> a character from A to Z repeated 3 times</li>
<li><code>-</code> the character <code>-</code></li>
<li><code>[4-7]</code> a digit from 4 to 7</li>
<li><code>\d{2,4}</code> any digit from 0 to 9 repeated between 2 and 4 times</li>
<li><code>\$</code> the character <code>$</code></li>
<li><code>$</code> the end of the string</li>
</ul>

blocks|key|2995435|text|正则表达式101|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2995436|转到regex101.com并将正则表达式粘贴到there...it中，将其描述给您。这将允许您在浏览器中测试regex。|2995437|给一个人一条鱼，你就喂他一天。教一个人钓鱼，你就能养活他一辈子。|2995438|REGEX|style|BOLD|2995439|/"%5E[A-Z]{3}-[4-7]\d{2,4}\$$"/|code-block|syntax|javascript|2995440|描述|2995441|"+Literal+"
%5E+Start+of+string
Char+class+[A-Z]+3+times+[greedy]+matches:
++++A-Z+A+character+range+between+Literal+A+and+Literal+Z
++++-+Literal+-
Char+class+[4-7]++matches:
++++4-7+A+character+range+between+Literal+4+and+Literal+7
\d+2+to+4+times+[greedy]+Digit+[0-9]
\$+Literal+$
$+End+of+string
"+Literal+"|2995442|可视化(感谢https://stackoverflow.com/users/633183/naomik)由http://www.debuggex.com/提供|2995443|​|2995444|📷|atomic|2995445|2995446|entityMap|0|LINK|mutability|MUTABLE|url|http://www.regex101.com/r/tX3wZ9|1|http://www.regex101.com/|2|https://stackoverflow.com/users/633183/naomik|3|http://www.debuggex.com/|4|IMAGE|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/5a5545619e20df9e39722784713df756.png|imageAlt^0|0|8|0|0|2|C|1|0|0|0|5|0|0|0|2|0|0|0|3|6|19|2|1H|O|3|0|0|0|1|4|0|0^^$0|@$1|2|3|4|5|6|7|1M|8|@]|9|@$A|1N|B|1O|1|1P]]|C|$]]|$1|D|3|E|5|6|7|1Q|8|@]|9|@$A|1R|B|1S|1|1T]]|C|$]]|$1|F|3|G|5|6|7|1U|8|@]|9|@]|C|$]]|$1|H|3|I|5|6|7|1V|8|@$A|1W|B|1X|J|K]]|9|@]|C|$]]|$1|L|3|M|5|N|7|1Y|8|@]|9|@]|C|$O|P]]|$1|Q|3|R|5|6|7|1Z|8|@$A|20|B|21|J|K]]|9|@]|C|$]]|$1|S|3|T|5|N|7|22|8|@]|9|@]|C|$O|P]]|$1|U|3|V|5|6|7|23|8|@$A|24|B|25|J|K]]|9|@$A|26|B|27|1|28]|$A|29|B|2A|1|2B]]|C|$]]|$1|W|3|X|5|6|7|2C|8|@]|9|@]|C|$]]|$1|Y|3|Z|5|10|7|2D|8|@]|9|@$A|2E|B|2F|1|2G]]|C|$]]|$1|11|3|X|5|6|7|2H|8|@]|9|@]|C|$]]|$1|12|3|-4|5|6|7|2I|8|@]|9|@]|C|$]]]|13|$14|$5|15|16|17|C|$18|19]]|1A|$5|15|16|17|C|$18|1B]]|1C|$5|15|16|17|C|$18|1D]]|1E|$5|15|16|17|C|$18|1F]]|1G|$5|1H|16|1I|C|$1J|1K|1L|-4]]]]

<h2><a href="http://www.regex101.com/r/tX3wZ9" rel="nofollow noreferrer">Regular Expressions 101</a></h2>

Go to <a href="http://www.regex101.com/" rel="nofollow noreferrer">regex101.com</a> and paste the regex in there...it will describe it to you. This will allow you to also test your regex within your browser. 

give a man a fish and you feed him for a day. Teach a man to fish and you feed him for a lifetime

REGEX

<pre><code>/"^[A-Z]{3}-[4-7]\d{2,4}\$$"/
</code></pre>

Description

<pre><code>" Literal "
^ Start of string
Char class [A-Z] 3 times [greedy] matches:
 A-Z A character range between Literal A and Literal Z
 - Literal -
Char class [4-7] matches:
 4-7 A character range between Literal 4 and Literal 7
\d 2 to 4 times [greedy] Digit [0-9]
\$ Literal $
$ End of string
" Literal "
</code></pre>

Visualization (thanks to <a href="https://stackoverflow.com/users/633183/naomik">naomik</a>) provided by <a href="http://www.debuggex.com/" rel="nofollow noreferrer">debuggex</a>

<img src="https://www.debuggex.com/i/s2IHEEJ8K1m7DBdT.png" alt="Regular expression visualization">

blocks|key|598675|text|想象一下！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|598676|​|598677|📷|atomic|offset|length|598678|598679|另外，这不是正则表达式(RegExp)；它只是一个字符串。|598680|如果您想使它成为一个RegExp：|598681|var+re+=+new+RegExp("%5E[A-Z]{3}-[4-7]\\d{2,4}\\$$");|code-block|syntax|javascript|598682|或者只是|598683|var+re+=+/%5E[A-Z]{3}-[4-7]\d{2,4}\$$/;|598684|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/e03a7e9b494a3e8a80a3876022df8e0c.png|imageAlt^0|0|0|0|1|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|15|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|16|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|17|8|@]|9|@$G|18|H|19|1|1A]]|A|$]]|$1|I|3|C|5|6|7|1B|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|1C|8|@]|9|@]|A|$]]|$1|L|3|M|5|6|7|1D|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|1E|8|@]|9|@]|A|$Q|R]]|$1|S|3|T|5|6|7|1F|8|@]|9|@]|A|$]]|$1|U|3|V|5|P|7|1G|8|@]|9|@]|A|$Q|R]]|$1|W|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]]|X|$Y|$5|Z|10|11|A|$12|13|14|-4]]]]

Visualize!

<img src="https://www.debuggex.com/i/ztdgsdDGHExXAhar.png" alt="Regular expression visualization">

Also, that's not a Regular Expression (RegExp); that's just a string.

If you want to make it a RegExp:

<pre><code>var re = new RegExp("^[A-Z]{3}-[4-7]\\d{2,4}\\$$");
</code></pre>

Or just

<pre><code>var re = /^[A-Z]{3}-[4-7]\d{2,4}\$$/;
</code></pre>

blocks|key|2995378|text|-[4-7]指的是字符-，后面跟着一个字符4、5、6和7。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2995379|第一个$被转义-因此它在输入中表示一个$，而第二个$没有转义，因此它指示字符串的结束。|2995380|entityMap^0|0|6|B|1|L|1|N|1|P|1|R|1|0|3|1|J|1|P|1|0^^$0|@$1|2|3|4|5|6|7|J|8|@$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]|$9|Q|A|R|B|C]|$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@]|E|$]]|$1|H|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|I|$]]

<code>-[4-7]</code> means the character <code>-</code> followed by one of the characters <code>4</code>, <code>5</code>, <code>6</code> and <code>7</code>.

The first <code>$</code> is escaped - so it indicates a <code>$</code> in the input, whereas the second <code>$</code> is not escaped, and so it indicates the end of the string.

blocks|key|1674785|text|-：这实际上是负-字符。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1674786|[4-7]：一个单数，4,5,6或7。|1674787|\$只是一个转义的$符号，所以它被解释为文本，而不是“字符串的结束”。|1674788|entityMap^0|0|1|8|1|0|0|5|0|0|2|9|1|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|T|8|@$9|U|A|V|B|C]|$9|W|A|X|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|K|$]]

<code>-</code>: this is literally the minus <code>-</code> character.

<code>[4-7]</code>: a single digit, either 4,5,6 or 7.

<code>\$</code> is just an escaped <code>$</code> sign, so it's interpreted as text, and not as "end of string".

i need to figure out what this regular expression means? 

<pre><code>"^[A-Z]{3}-[4-7]\d{2,4}\$$"
</code></pre>

I think it starts with exactly 3 letters and ends with 2,3 or 4 digits (also not sure about the dubble $-sings) .

But I can't understand what this means:

<pre><code> -[4-7] 
</code></pre>

And I'm also not sure why there are 2 $ at the end ...

thanks

What is the meaning of this regexp?

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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我需要弄清楚这个正则表达式是什么意思？"^[A-Z]{3}-[4-7]\d{2,4}\$$"我认为它的开头是3个字母，结尾是2,3或4位数字(也不确定双唱$-sing)。但我不明白这意味着什么     -[4-7]  我也不知道为什么最后有2块钱.谢谢

问这个regexp的意义是什么？
EN

回答 5

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问这个regexp的意义是什么？EN

回答 5

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问这个regexp的意义是什么？
EN