blocks|key|1759113|text|那/%5E[A-Za-z]{4}\d{7}$/呢|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1759114|检查这里|1759115|编辑|BOLD|1759116|根据其他答案中IFSC代码的定义，前4个字符为数字，其余7个字符为字母数字，regex为|1759117|%5E[]{4}[a-Za-Z0-9]{7}$|1759118|entityMap|0|LINK|mutability|MUTABLE|url|https://regex101.com/r/lM4hS9/1|1|https://regex101.com/r/C5yj0u/1^0|1|K|0|2|2|0|0|0|2|0|0|0|L|1|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@]|D|@$9|12|A|13|1|14]]|E|$]]|$1|H|3|I|5|6|7|15|8|@$9|16|A|17|B|J]]|D|@]|E|$]]|$1|K|3|L|5|6|7|18|8|@]|D|@]|E|$]]|$1|M|3|N|5|6|7|19|8|@]|D|@$9|1A|A|1B|1|1C]]|E|$]]|$1|O|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]|W|$5|R|S|T|E|$U|X]]]]

What about <code>/^[A-Za-z]{4}\d{7}$/</code>

Check <a href="https://regex101.com/r/lM4hS9/1" rel="noreferrer">here</a>

Edit

As per definitions of IFSC code posted here in other answers, it is first 4 characters as digit and remaining 7 characters as alphanumeric , regex would be

<a href="https://regex101.com/r/C5yj0u/1" rel="noreferrer">^[A-Za-z]{4}[a-zA-Z0-9]{7}$</a>

blocks|key|2408015|text|根据维基百科印度金融系统代码|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2408016|IFSC代码格式：|2408017|1]确切长度应为11|2408018|2]前4字母表|2408019|第五个字符是0(零)|2408020|最后六个字符(通常是数字，但可以是字母)|2408021|试试这个：-|2408022|%5E[A-Za-z]{4}0[A-Z0-9a-z]{6}$|code-block|syntax|javascript|2408023|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/Indian_Financial_System_Code^0|2|C|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@$A|13|B|14|1|15]]|C|$]]|$1|D|3|E|5|6|7|16|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|17|8|@]|9|@]|C|$]]|$1|H|3|I|5|6|7|18|8|@]|9|@]|C|$]]|$1|J|3|K|5|6|7|19|8|@]|9|@]|C|$]]|$1|L|3|M|5|6|7|1A|8|@]|9|@]|C|$]]|$1|N|3|O|5|6|7|1B|8|@]|9|@]|C|$]]|$1|P|3|Q|5|R|7|1C|8|@]|9|@]|C|$S|T]]|$1|U|3|-4|5|6|7|1D|8|@]|9|@]|C|$]]]|V|$W|$5|X|Y|Z|C|$10|11]]]]

According to <a href="https://en.wikipedia.org/wiki/Indian_Financial_System_Code" rel="noreferrer">Indian Financial System Code on wikipedia</a>

IFSC Code Format:

1] Exact length should be 11

2] First 4 alphabets

3] Fifth character is 0 (zero)

4] Last six characters (usually numeric, but can be alphabetic)

Try this:-

<pre><code>^[A-Za-z]{4}0[A-Z0-9a-z]{6}$
</code></pre>

blocks|key|1759339|text|根据新规则，RBI修改了IFSC准则，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1759340|IFSC代码的新格式:例如。ABCD0123456|offset|length|style|BOLD|1759341|IFSC是一个11个字符的代码，前四个字母表示银行名称，最后六个字符(通常是数字，但可以是字母)表示分行。第五个字符为0(零)，保留供以后使用。NEFT+&+RTGS系统使用银行IFS代码将消息路由到目标银行/分支机构。|1759342|代码验证：“%5EA{4}{6}$”|1759343|为Java|1759344|public+static+boolean+isIfscCodeValid(String+IFSCCode)+
{
++++String+regExp+=+"%5E[A-Z]{4}[0][A-Z0-9]{6}$";
++++boolean+isvalid+=+false;

++++if+(IFSCCode.length()+>+0)+{
++++++++isvalid+=+IFSCCode.matches(regExp);
++++}
++++return+isvalid;
}|code-block|syntax|javascript|1759345|其中isIfscCodevalid()是常见的静态方法，它接受来自用户的string作为参数(String+email)输入，并与regExp匹配以进行IFSC代码验证，并将值返回为true或false。|1759346|entityMap^0|0|E|B|0|0|5|B|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|10|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|11|8|@$D|12|E|13|F|G]]|9|@]|A|$]]|$1|L|3|M|5|6|7|14|8|@]|9|@]|A|$]]|$1|N|3|O|5|P|7|15|8|@]|9|@]|A|$Q|R]]|$1|S|3|T|5|6|7|16|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|V|$]]

As per new rules, RBI changed it's guideline for IFSC Code,
New Format for IFSC Code :
Eg. ABCD0123456
The IFSC is an 11-character code with the first four alphabetic characters representing the bank name, and the last six characters (usually numeric, but can be alphabetic) representing the branch. The fifth character is 0 (zero) and reserved for future use. Bank IFS Code is used by the NEFT &amp; RTGS systems to route the messages to the destination banks/branches.
For Code Validation : &quot;^[A-Z]{4}[0][A-Z0-9]{6}$&quot;
For Java:
<pre><code>public static boolean isIfscCodeValid(String IFSCCode) 
{
 String regExp = &quot;^[A-Z]{4}[0][A-Z0-9]{6}$&quot;;
 boolean isvalid = false;

 if (IFSCCode.length() &gt; 0) {
 isvalid = IFSCCode.matches(regExp);
 }
 return isvalid;
}
</code></pre>
where isIfscCodevalid() is common static method, which accepts string as parameter(String email) input from User and matches with regExp for IFSC Code Validation and returns the value as true or false.

blocks|key|1759262|text|试试看，它与4个字母和6或7位数字一起完美地工作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1759263|IFSC代码:+SBIN1234567
IFSC代码:+HDFC0123654
IFSC代码:+SBIN123456|blockquote|1759264|​|1759265|$(document).ready(function()+{
++$.validator.addMethod("ifsc",+function(value,+element)+{
++++var+reg+=+/%5E[A-Za-z]{4}[0-9]{6,7}$/;
++++if+(this.optional(element))+{
++++++console.log(value);
++++++console.log(element);
++++++return+true;
++++}
++++if+(value.match(reg))+{
++++++return+true;
++++}+else+{
++++++return+false;
++++}
++},+"Please+specify+a+valid+IFSC+CODE");

++$('#myform').validate({+//+initialize+the+plugin
++++rules:+{
++++++ifsc:+{
++++++++required:+true,
++++++++ifsc:+true
++++++}

++++},
++++submitHandler:+function(form)+{
++++++alert('valid+form+submitted');
++++++return+false;
++++}
++});

});|code-block|syntax|javascript|1759266|<script+src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<script+src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.17.0/jquery.validate.js"></script>


<form+id="myform"+action=""+method="post">
++<div>
++++<label>IFSC+CODE</label>
++++<div>
++++++<input+type="text"+name="ifsc"+value=""+id="input-ifsc"+/>
++++</div>
++</div>
++<button+type="submit">Register</button>
</form>|1759267|1759268|IFSC代码描述：|1759269|确切长度应该是11|ordered-list-item|1759270|前4字母|1759271|第五个字符是0(零)|1759272|最后六个字符(通常是数字，但可以是字母)|1759273|IFSC代码:+BARB0SANAND
IFSC代码:+SBIN0123456|1759274|用代码替换上面的JavaScript|1759275|var+reg+=+/%5E[A-Za-z]{4}[0-9]{6,7}$/;|1759276|至|1759277|var+reg+=+/%5E[A-Za-z]{4}0[A-Z0-9]{6}$/;|1759278|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1C|8|@]|9|@]|A|$]]|$1|E|3|F|5|6|7|1D|8|@]|9|@]|A|$]]|$1|G|3|H|5|I|7|1E|8|@]|9|@]|A|$J|K]]|$1|L|3|M|5|I|7|1F|8|@]|9|@]|A|$J|K]]|$1|N|3|F|5|6|7|1G|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|1H|8|@]|9|@]|A|$]]|$1|Q|3|R|5|S|7|1I|8|@]|9|@]|A|$]]|$1|T|3|U|5|S|7|1J|8|@]|9|@]|A|$]]|$1|V|3|W|5|S|7|1K|8|@]|9|@]|A|$]]|$1|X|3|Y|5|S|7|1L|8|@]|9|@]|A|$]]|$1|Z|3|10|5|D|7|1M|8|@]|9|@]|A|$]]|$1|11|3|12|5|6|7|1N|8|@]|9|@]|A|$]]|$1|13|3|14|5|I|7|1O|8|@]|9|@]|A|$J|K]]|$1|15|3|16|5|6|7|1P|8|@]|9|@]|A|$]]|$1|17|3|18|5|I|7|1Q|8|@]|9|@]|A|$J|K]]|$1|19|3|-4|5|6|7|1R|8|@]|9|@]|A|$]]]|1A|$]]

Try this it perfectly works with 4 alphabets followed by 6 or 7 digits
<blockquote>
IFSC Code: SBIN1234567
IFSC Code: HDFC0123654
IFSC Code: SBIN123456
</blockquote>
<div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>$(document).ready(function() {
 $.validator.addMethod("ifsc", function(value, element) {
 var reg = /^[A-Za-z]{4}[0-9]{6,7}$/;
 if (this.optional(element)) {
 console.log(value);
 console.log(element);
 return true;
 }
 if (value.match(reg)) {
 return true;
 } else {
 return false;
 }
 }, "Please specify a valid IFSC CODE");

 $('#myform').validate({ // initialize the plugin
 rules: {
 ifsc: {
 required: true,
 ifsc: true
 }

 },
 submitHandler: function(form) {
 alert('valid form submitted');
 return false;
 }
 });

});</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"&gt;&lt;/script&gt;

&lt;script src="https://cdnjs.cloudflare.com/ajax/libs/jquery-validate/1.17.0/jquery.validate.js"&gt;&lt;/script&gt;


&lt;form id="myform" action="" method="post"&gt;
 &lt;div&gt;
 &lt;label&gt;IFSC CODE&lt;/label&gt;
 &lt;div&gt;
 &lt;input type="text" name="ifsc" value="" id="input-ifsc" /&gt;
 &lt;/div&gt;
 &lt;/div&gt;
 &lt;button type="submit"&gt;Register&lt;/button&gt;
&lt;/form&gt;</code></pre>
</div>
</div>

IFSC Code description:
<ol>
<li>Exact length should be 11</li>
<li>First 4 alphabets</li>
<li>Fifth character is 0 (zero)</li>
<li>Last six characters (usually numeric, but can be alphabetic)</li>
</ol>
<blockquote>
IFSC Code: BARB0SANAND
IFSC Code: SBIN0123456
</blockquote>
Replace the above JavaScript with the code
<pre><code>var reg = /^[A-Za-z]{4}[0-9]{6,7}$/;
</code></pre>
to
<pre><code>var reg = /^[A-Za-z]{4}0[A-Z0-9]{6}$/;
</code></pre>

blocks|key|30834|text|第五个字符必须是0，最后六个字符可以是字母或数字+(来源)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|30835|所以这应该是可行的：%5E[A-Za-z]{4}0[A-Z0-9a-z]{6}$|CODE|30836|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikipedia.org/wiki/Indian_Financial_System_Code^0|J|5|P|4|0|0|A|S|0^^$0|@$1|2|3|4|5|6|7|Q|8|@$9|R|A|S|B|C]]|D|@$9|T|A|U|1|V]]|E|$]]|$1|F|3|G|5|6|7|W|8|@$9|X|A|Y|B|H]]|D|@]|E|$]]|$1|I|3|-4|5|6|7|Z|8|@]|D|@]|E|$]]]|J|$K|$5|L|M|N|E|$O|P]]]]

The 5th character has to be a 0 and last six characters can be alphabetic or numeric <a href="https://en.wikipedia.org/wiki/Indian_Financial_System_Code" rel="nofollow noreferrer">(source)</a> 

So this should work:
<code>^[A-Za-z]{4}0[A-Z0-9a-z]{6}$</code>

blocks|key|2407906|text|IFSC+(印度金融系统代码)代码包含11个字符、字母、数字、唯一的代码，RBI将其分配给银行分行，以识别印度境内每家银行的分行。前四个字母是银行名称，最后六个字符(通常是数字，但可以是字母)表示分行。第五个字符为0(零)，保留供以后使用，请参阅http://www.codeforbanks.com/banks/ifsccode-by-branch/的IFSC代码的详细信息。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2407907|entityMap|0|LINK|mutability|MUTABLE|url|http://www.codeforbanks.com/banks/ifsccode-by-branch/^0|3F|1H|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

IFSC (Indian Financial System Code) code contains 11 characters alphanumeric unique code and is assigned by RBI to the bank branch to identify each branch of every bank in India. The first four alphabetic is bank name, and the last six characters (usually numeric, but can be alphabetic) representing the branch. The fifth character is 0 (zero) and reserved for future use
Find more details of IFSC code from <a href="http://www.codeforbanks.com/banks/ifsccode-by-branch/" rel="nofollow noreferrer">http://www.codeforbanks.com/banks/ifsccode-by-branch/</a>

blocks|key|30859|text|有许多IFS代码不是这样的格式。例如，YESB0CCUB18。您可以简单地将它放到google上来验证这段代码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|30860|我建议不要进行特定的验证，只需验证长度或最大验证长度，并将前四个字符作为字符。|30861|虽然与问题无关，但如果您想搜索IFS代码，您可以参考以下网站：https://www.bankifscodes.com|offset|length|30862|entityMap|0|LINK|mutability|MUTABLE|url|https://www.bankifscodes.com/^0|0|0|V|S|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@$F|S|G|T|1|U]]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

There are many IFS Codes which are not in such format. For e.g. YESB0CCUB18. You can verify this code by simply putting it on google.

I would recommend not to go for a specific validation, simply validate the length or at maximum validate the length and first four to be characters.

Although not related to the question, but in case you want to search IFS Codes, you can refer this website: <a href="https://www.bankifscodes.com" rel="nofollow noreferrer">https://www.bankifscodes.com</a>

blocks|key|2408032|text|RBI更改了IFSC代码的指导方针，所以请在代码中遵循这个Regex，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2408033|Regex根据新规则-+%5EA-Z{4}0A-Z0-9{6}$|offset|length|style|BOLD|2408034|示例IFSC代码根据新的指南-+BARB0SANAND+IFSC或印度金融系统代码是一种阿尔法数字代码，它唯一地标识参加NEFT系统的银行分支机构。这是一个11位代码，前4个字母代表银行，最后6个字符代表分行。第五个字符是0(零)。NEFT系统使用IFSC识别原始/目的地银行/分支机构，并适当地将消息路由到有关银行/分支机构。|2408035|entityMap^0|0|C|I|0|G|B|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|P|8|@$D|Q|E|R|F|G]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|S|8|@]|9|@]|A|$]]]|K|$]]

RBI Changed it's guidline for IFSC code, so please follow this Regex in your code, 

Regex as per new rules - ^[A-Z]{4}0[A-Z0-9]{6}$

Sample IFSC Code as per new Guidline - BARB0SANAND
IFSC or Indian Financial System Code is an alpha-numeric code that uniquely identifies a bank-branch participating in the NEFT system. This is an 11 digit code with the first 4 alpha characters representing the bank, and the last 6 characters representing the branch. The 5th character is 0 (zero). IFSC is used by the NEFT system to identify the originating / destination banks / branches and also to route the messages appropriately to the concerned banks / branches.

blocks|key|31041|text|我发现这个很有用：/%5E([a-zA-Z]){4}([0-9]){7}?$/|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|31042|entityMap^0|9|S|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

I found this one working:
<code>/^([a-zA-Z]){4}([0-9]){7}?$/</code>

blocks|key|31037|text|IFSC代码由11个字符组成，但前4个字符是字母，最后7个字符是数字，这不是强制性的。是的，在大多数情况下，这是真的，但在某些情况下，它不是正确的方式。例如：我为巴罗达银行找到了一个IFSC代码"BARB0RAJVIS“。在这种情况下，此表达式将返回false。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|31038|我建议使用RazorPay+API获取/检查银行详细信息以获得更多信息。|31039|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

IFSC Code consists of 11 characters but it is not mandatory that the first 4 are alphabetic and the last 7 are numerics.
Yes, in most cases it is true but there are certain cases in which it's not the correct way.
eg. I found one IFSC code &quot;BARB0RAJVIS&quot; for Bank of Baroda. In such case, this expression will return false.
I would recommend to use RazorPay API to fetch/check Bank Details for more information.

IFSC Code description:

<ol>
<li>Exact length should be 11</li>
<li>First 4 alphabets</li>
<li>Fifth character is 0 (zero)</li>
<li>Last six characters (usually numeric, but can be alphabetic) </li>
</ol>

E.g. 

<blockquote>
 SBIN1234567
</blockquote>

Here is what I tried but its not working.

<pre><code>("^[^\s]{4}\d{7}$")
</code></pre>

Regular expression for IFSC code(first four alphabet and then 7 digit.)

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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IFSC代码描述：确切长度应该是11前4字母第五个字符是0(零)最后六个字符(通常是数字，但可以是字母)例如。SBIN1234567这是我试过的，但不起作用。("^[^\s]{4}\d{7}$")

问IFSC代码的正则表达式(前四个字母，然后是7个数字)。
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问IFSC代码的正则表达式(前四个字母，然后是7个数字)。
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