blocks|key|2123230|text|使用正则表达式并与移动数字字符串匹配。|type|blockquote|depth|inlineStyleRanges|entityRanges|data|2123231|string+mobileNumber+=+"%2B8801000000000";
if+(new+Regex(@"%5E(?:\%2B?88%7C0088)?01[15-9]\d{8}$").IsMatch(mobileNumber)){
++++MessageBox.Show("Mobile+number+is+valide",+"All+information+is+required",+MessageBoxButtons.OK,+MessageBoxIcon.Asterisk);
}
else{
+++++MessageBox.Show("Mobile+number+is+not+valide",+"All+information+is+required",+MessageBoxButtons.OK,+MessageBoxIcon.Error);
}|code-block|syntax|javascript|2123232|unstyled|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|K|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|H|7|L|8|@]|9|@]|A|$]]]|I|$]]

<blockquote>
 Use Regular Expressions and match with mobile number string.
</blockquote>

<pre><code>string mobileNumber = "+8801000000000";
if (new Regex(@"^(?:\+?88|0088)?01[15-9]\d{8}$").IsMatch(mobileNumber)){
 MessageBox.Show("Mobile number is valide", "All information is required", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
}
else{
 MessageBox.Show("Mobile number is not valide", "All information is required", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
</code></pre>

blocks|key|2123267|text|我看你试过了，但你的判罚不准确。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2123268|您不使用字符串$锚点的末尾(因此，即使最后的"abc“也不会阻止IsMatch返回true)。|ordered-list-item|offset|length|style|CODE|2123269|您在方括号内使用01，从而创建一个字符类，这意味着0或1。|2123270|在这里不需要捕获组，非捕获是可选子模式的最佳选择。|2123271|正如后续答案中所指出的，您使用的正则表达式实际上并不满足孟加拉国电话号码的所有要求，参见Kobi的%5E(?:\%2B?88%7C0088)?01[15-9]\d{8}$答案。|2123272|为了创建一个正则表达式来验证具有“可选的%2B88__、0088或01”的字符串，您需要如下所示：|2123273|@"%5E(?:(?:\%2B%7C00)88%7C01)?\d{11}$"|code-block|syntax|javascript|2123274|请参阅RegexStorm演示|2123275|更新|BOLD|2123276|如果要使用此正则表达式验证孟加拉国的电话号码，则模式中没有任何更改(只有\r?是完全多余的)，但如果计划在%2B88或01之后允许13或11位数字，则需要使用替换：|2123277|ng-pattern="/%5E(?:(?:\%2B%7C00)88%7C01)?\d{11}$/"|2123278|请参阅演示|2123279|在角度上：|2123280|Validators.pattern('(?:(?:\\%2B%7C00)88%7C01)?\\d{11}')
//+or
Validators.pattern(/%5E(?:(?:\%2B%7C00)88%7C01)?\d{11}$/)|2123281|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/15088746/3832970|1|http://regexstorm.net/tester?p=%255e%2528%253f%253a%2528%253f%253a%255c%252b%257c00%252988%257c01%2529%253f%255cd%257b11%257d%255cr%253f%2524&i=%252b8812345678901%250d%250a0112345678901%250d%250a12345678901%250d%250a%252b8801812598624%250d%250a008801812598624%250d%250a01812598624%250d%250a01712598624%250d%250a01672598624%250d%250a01919598624%250d%250a01419598624%250d%250a01319598624&o=m|2|https://regex101.com/r/cD5pE5/47^0|0|7|1|W|7|15|4|0|8|2|P|1|R|1|0|0|1D|U|1D|U|0|0|K|3|Q|4|V|2|0|0|3|C|1|0|0|2|0|10|3|1H|3|1L|2|0|0|3|2|2|0|0|0^^$0|@$1|2|3|4|5|6|7|1M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|1N|8|@$E|1O|F|1P|G|H]|$E|1Q|F|1R|G|H]|$E|1S|F|1T|G|H]]|9|@]|A|$]]|$1|I|3|J|5|D|7|1U|8|@$E|1V|F|1W|G|H]|$E|1X|F|1Y|G|H]|$E|1Z|F|20|G|H]]|9|@]|A|$]]|$1|K|3|L|5|D|7|21|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|22|8|@$E|23|F|24|G|H]]|9|@$E|25|F|26|1|27]]|A|$]]|$1|O|3|P|5|6|7|28|8|@$E|29|F|2A|G|H]|$E|2B|F|2C|G|H]|$E|2D|F|2E|G|H]]|9|@]|A|$]]|$1|Q|3|R|5|S|7|2F|8|@]|9|@]|A|$T|U]]|$1|V|3|W|5|6|7|2G|8|@]|9|@$E|2H|F|2I|1|2J]]|A|$]]|$1|X|3|Y|5|6|7|2K|8|@$E|2L|F|2M|G|Z]]|9|@]|A|$]]|$1|10|3|11|5|6|7|2N|8|@$E|2O|F|2P|G|H]|$E|2Q|F|2R|G|H]|$E|2S|F|2T|G|H]]|9|@]|A|$]]|$1|12|3|13|5|S|7|2U|8|@]|9|@]|A|$T|U]]|$1|14|3|15|5|6|7|2V|8|@]|9|@$E|2W|F|2X|1|2Y]]|A|$]]|$1|16|3|17|5|6|7|2Z|8|@]|9|@]|A|$]]|$1|18|3|19|5|S|7|30|8|@]|9|@]|A|$T|U]]|$1|1A|3|-4|5|6|7|31|8|@]|9|@]|A|$]]]|1B|$1C|$5|1D|1E|1F|A|$1G|1H]]|1I|$5|1D|1E|1F|A|$1G|1J]]|1K|$5|1D|1E|1F|A|$1G|1L]]]]

I see you have tried but your regex is not accurate.
<ol>
<li>You do not use an end of string <code>$</code> anchor (thus, even &quot;abc&quot; at the end will not prevent the <code>IsMatch</code> from returning <code>true</code>)</li>
<li>You are using <code>01</code> inside square brackets thus creating a character class, meaning either <code>0</code> or <code>1</code>.</li>
<li>No need in a capturing group here, a non-capturing is best for optional subpatterns.</li>
<li>As has been pointed out in the follow up answers, the regex you are using is not actually meeting all the requirements for the Bangladeshi phone number, see Kobi's <a href="https://stackoverflow.com/a/15088746/3832970"><code>^(?:\+?88|0088)?01[15-9]\d{8}$</code></a> answer.</li>
</ol>
In order to create a regex that will validate a string that has &quot;optional <code>+88</code>, <code>0088</code> or <code>01</code> preceeding 11 digits&quot;, you need something like:
<pre><code>@&quot;^(?:(?:\+|00)88|01)?\d{11}$&quot;
</code></pre>
See <a href="http://regexstorm.net/tester?p=%5e%28%3f%3a%28%3f%3a%5c%2b%7c00%2988%7c01%29%3f%5cd%7b11%7d%5cr%3f%24&amp;i=%2b8812345678901%0d%0a0112345678901%0d%0a12345678901%0d%0a%2b8801812598624%0d%0a008801812598624%0d%0a01812598624%0d%0a01712598624%0d%0a01672598624%0d%0a01919598624%0d%0a01419598624%0d%0a01319598624&amp;o=m" rel="nofollow noreferrer">RegexStorm demo</a>
UPDATE
If you want to validate Bangladeshi phone numbers with this regex, nothing changes in the pattern (only <code>\r?</code> is totally redundant), but if you plan to allow 13 or 11 digits after <code>+88</code> or <code>01</code>, you need to use an alternation:
<pre><code>ng-pattern=&quot;/^(?:(?:\+|00)88|01)?\d{11}$/&quot;
</code></pre>
See <a href="https://regex101.com/r/cD5pE5/47" rel="nofollow noreferrer">demo</a>
In Angular:
<pre class="lang-js prettyprint-override"><code>Validators.pattern('(?:(?:\\+|00)88|01)?\\d{11}')
// or
Validators.pattern(/^(?:(?:\+|00)88|01)?\d{11}$/)
</code></pre>

blocks|key|1081016|text|一个更好的答案可以在这里找到：使用正则表达式验证移动号码|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1081017|这篇文章有两个很好的答案。摘要|1081018|解决方案-1:使用正则表达式|1081019|应该很简单：|1081020|%5E(?:\%2B?88%7C0088)?01[15-9]\d{8}$|code-block|syntax|javascript|1081021|%5E+-从字符串开始|unordered-list-item|style|CODE|1081022|(?:\%2B?88%7C0088)?+-可选的88，可以以%2B或可选的0088开头|1081023|01+-强制性01|1081024|[15-9]+-+"1或5或6或7或8或9“|1081025|\d{8}+-8位数|1081026|$+-字符串的末尾|1081027|工作示例：http://rubular.com/r/BvnSXDOYF8|1081028|解决方案-2:使用库|1081029|下载此免费库来自Google的libphonenumber。它适用于Java、C%2B%2B和Javascript，但也有用于PHP的叉，我相信还有其他语言。|1081030|%2B880告诉我它是孟加拉国国家代码。让我们尝试用以下Java代码验证示例编号：|1081031|String+bdNumberStr+=+"8801711419556";
PhoneNumberUtil+phoneUtil+=+PhoneNumberUtil.getInstance();
try+{
++++//BD+is+default+country+code+for+Bangladesh+(used+for+number+without+880+at+the+begginning)
++++PhoneNumber+bdNumberProto+=+phoneUtil.parse(bdNumberStr,+"BD");
}+catch+(NumberParseException+e)+{
++++System.err.println("NumberParseException+was+thrown:+"+%2B+e.toString());
}
boolean+isValid+=+phoneUtil.isValidNumber(bdNumberProto);+//+returns+true|1081032|该代码还将处理带有空格的数字(例如"880+17+11+41+95+56")，甚至在乞讨处使用00880+(%2B有时被替换为00)。|1081033|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/15088518/validate-mobile-number-using-regular-expression|1|http://rubular.com/r/BvnSXDOYF8|2|https://github.com/googlei18n/libphonenumber|3|http://www.countrycallingcodes.com/country.php?country=Bangladesh^0|F|D|0|0|0|0|0|0|0|1|0|0|F|K|2|Q|1|V|4|0|0|2|7|2|0|0|6|0|0|5|0|0|1|0|5|V|1|0|0|6|N|2|0|9|8|3|0|0|0^^$0|@$1|2|3|4|5|6|7|1T|8|@]|9|@$A|1U|B|1V|1|1W]]|C|$]]|$1|D|3|E|5|6|7|1X|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|1Y|8|@]|9|@]|C|$]]|$1|H|3|I|5|6|7|1Z|8|@]|9|@]|C|$]]|$1|J|3|K|5|L|7|20|8|@]|9|@]|C|$M|N]]|$1|O|3|P|5|Q|7|21|8|@$A|22|B|23|R|S]]|9|@]|C|$]]|$1|T|3|U|5|Q|7|24|8|@$A|25|B|26|R|S]|$A|27|B|28|R|S]|$A|29|B|2A|R|S]|$A|2B|B|2C|R|S]]|9|@]|C|$]]|$1|V|3|W|5|Q|7|2D|8|@$A|2E|B|2F|R|S]|$A|2G|B|2H|R|S]]|9|@]|C|$]]|$1|X|3|Y|5|Q|7|2I|8|@$A|2J|B|2K|R|S]]|9|@]|C|$]]|$1|Z|3|10|5|Q|7|2L|8|@$A|2M|B|2N|R|S]]|9|@]|C|$]]|$1|11|3|12|5|Q|7|2O|8|@$A|2P|B|2Q|R|S]]|9|@]|C|$]]|$1|13|3|14|5|6|7|2R|8|@]|9|@$A|2S|B|2T|1|2U]]|C|$]]|$1|15|3|16|5|6|7|2V|8|@]|9|@]|C|$]]|$1|17|3|18|5|6|7|2W|8|@]|9|@$A|2X|B|2Y|1|2Z]]|C|$]]|$1|19|3|1A|5|6|7|30|8|@]|9|@$A|31|B|32|1|33]]|C|$]]|$1|1B|3|1C|5|L|7|34|8|@]|9|@]|C|$M|N]]|$1|1D|3|1E|5|6|7|35|8|@]|9|@]|C|$]]|$1|1F|3|-4|5|6|7|36|8|@]|9|@]|C|$]]]|1G|$1H|$5|1I|1J|1K|C|$1L|1M]]|1N|$5|1I|1J|1K|C|$1L|1O]]|1P|$5|1I|1J|1K|C|$1L|1Q]]|1R|$5|1I|1J|1K|C|$1L|1S]]]]

A better answer can be found here: <a href="https://stackoverflow.com/questions/15088518/validate-mobile-number-using-regular-expression">Validate Mobile number using regular expression</a>
There is two good answer in this post. Summary of them
<h2>Solution-1: Using regular expression</h2>
Should be pretty simple:
<pre><code>^(?:\+?88|0088)?01[15-9]\d{8}$
</code></pre>
<ul>
<li><code>^</code> - From start of the string</li>
<li><code>(?:\+?88|0088)?</code> - optional <code>88</code>, which may begin in <code>+</code> or optional <code>0088</code></li>
<li><code>01</code> - mandatory <code>01</code></li>
<li><code>[15-9]</code> - &quot;1 or 5 or 6 or 7 or 8 or 9&quot;</li>
<li><code>\d{8}</code> - 8 digits</li>
<li><code>$</code> - end of the string</li>
</ul>
Working example: <a href="http://rubular.com/r/BvnSXDOYF8" rel="nofollow noreferrer">http://rubular.com/r/BvnSXDOYF8</a>
<h2>Solution-2: Using Library</h2>
Download this free library <a href="https://github.com/googlei18n/libphonenumber" rel="nofollow noreferrer">libphonenumber from Google</a>. It's available for Java, C++ and Javascript, but there're also fork for PHP and, i believe, other languages.
+880 tells me that it's <a href="http://www.countrycallingcodes.com/country.php?country=Bangladesh" rel="nofollow noreferrer">country code for Bangladesh</a>. Let's try to validate example numbers with following code in Java:
<pre><code>String bdNumberStr = &quot;8801711419556&quot;;
PhoneNumberUtil phoneUtil = PhoneNumberUtil.getInstance();
try {
 //BD is default country code for Bangladesh (used for number without 880 at the begginning)
 PhoneNumber bdNumberProto = phoneUtil.parse(bdNumberStr, &quot;BD&quot;);
} catch (NumberParseException e) {
 System.err.println(&quot;NumberParseException was thrown: &quot; + e.toString());
}
boolean isValid = phoneUtil.isValidNumber(bdNumberProto); // returns true
</code></pre>
That code will handle also numbers with spaces in it (for example &quot;880 17 11 41 95 56&quot;), or even with 00880 at the beggininng (+ is sometimes replaced with 00).

blocks|key|1081046|text|基本上，孟加拉国的国家电话号码是880，然后是10位数。国际电话可能以“%2B”或“00”开头。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1081047|国家代码不用于本地呼叫，但一开始必须为0。|1081048|因此正则表达式如下所示：|1081049|%5E(((\%2B%7C00)?880)%7C0)(\d){10}$|code-block|syntax|javascript|1081050|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|O|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|P|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

basically, Bangladesh country phone code is 880, then 10 digit.
It may start with '+' or '00' for the international call.

Country code does not use for local call but must be 0 at first.

so the regex will be like this below:

<pre><code>^(((\+|00)?880)|0)(\d){10}$
</code></pre>

blocks|key|1081077|text|您可以使用任何一个给定的解决方案来验证孟加拉国的移动电话号码。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1081078|正则表达式1:|offset|length|style|BOLD|1081079|/(%5E(\%2B88%7C0088)?(01){1}[3456789]{1}(\d){8})$/|code-block|syntax|javascript|1081080|正则表达式2|1081081|+/(%5E(\%2B8801%7C8801%7C01%7C008801))[1%7C3-9]{1}(\d){8}$/|1081082|正则表达式3|1081083|+(%5E([%2B]{1}[8]{2}%7C0088)?(01){1}[3-9]{1}\d{8})$|1081084|允许移动号码示例|1081085|%2B8801812598624|1081086|008801812598624|1081087|01812598624|1081088|01712598624|1081089|01672598624|1081090|01919598624|1081091|01419598624|1081092|01319598624|1081093|等|1081094|entityMap^0|0|0|7|0|0|0|6|0|0|0|6|0|0|0|8|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1G|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1H|8|@$D|1I|E|1J|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|1K|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|1L|8|@$D|1M|E|1N|F|G]]|9|@]|A|$]]|$1|O|3|P|5|J|7|1O|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|1P|8|@$D|1Q|E|1R|F|G]]|9|@]|A|$]]|$1|S|3|T|5|J|7|1S|8|@]|9|@]|A|$K|L]]|$1|U|3|V|5|6|7|1T|8|@$D|1U|E|1V|F|G]]|9|@]|A|$]]|$1|W|3|X|5|6|7|1W|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|1X|8|@]|9|@]|A|$]]|$1|10|3|11|5|6|7|1Y|8|@]|9|@]|A|$]]|$1|12|3|13|5|6|7|1Z|8|@]|9|@]|A|$]]|$1|14|3|15|5|6|7|20|8|@]|9|@]|A|$]]|$1|16|3|17|5|6|7|21|8|@]|9|@]|A|$]]|$1|18|3|19|5|6|7|22|8|@]|9|@]|A|$]]|$1|1A|3|1B|5|6|7|23|8|@]|9|@]|A|$]]|$1|1C|3|1D|5|6|7|24|8|@]|9|@]|A|$]]|$1|1E|3|-4|5|6|7|25|8|@]|9|@]|A|$]]]|1F|$]]

You may use any one of given solution to validate Bangladeshi mobile number.

regular expression 1:

<pre><code>/(^(\+88|0088)?(01){1}[3456789]{1}(\d){8})$/
</code></pre>

regular expression 2

<pre><code> /(^(\+8801|8801|01|008801))[1|3-9]{1}(\d){8}$/
</code></pre>

regular expression 3

<pre><code> (^([+]{1}[8]{2}|0088)?(01){1}[3-9]{1}\d{8})$
</code></pre>

Allowed mobile number sample

+8801812598624

008801812598624

01812598624

01712598624

01672598624

01919598624

01419598624

01319598624

etc

blocks|key|2123495|text|使用此正则表达式"%5E(?:%2B88%7C88)?(013-9\d{8})$“此表达式覆盖所有孟加拉国移动运营商，如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2123496|013|unordered-list-item|2123497|014|2123498|2123499|016|2123500|017|2123501|018xxxxxxx|2123502|019|2123503|示例：|2123504|String+mobileNumber+="01715254815";

if(mobileNumber.matches("%5E(?:\\%2B88%7C88)?(01[3-9]\\d{8})$")){
++++System.out.println("Yes+valid");
}|code-block|syntax|javascript|2123505|entityMap^0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|10|8|@]|9|@]|A|$]]|$1|G|3|F|5|D|7|11|8|@]|9|@]|A|$]]|$1|H|3|I|5|D|7|12|8|@]|9|@]|A|$]]|$1|J|3|K|5|D|7|13|8|@]|9|@]|A|$]]|$1|L|3|M|5|D|7|14|8|@]|9|@]|A|$]]|$1|N|3|O|5|D|7|15|8|@]|9|@]|A|$]]|$1|P|3|Q|5|6|7|16|8|@]|9|@]|A|$]]|$1|R|3|S|5|T|7|17|8|@]|9|@]|A|$U|V]]|$1|W|3|-4|5|6|7|18|8|@]|9|@]|A|$]]]|X|$]]

Use this regular expression &quot;^(?:+88|88)?(01[3-9]\d{8})$&quot; this cover all Bangladeshi's mobile operators, like:
<ul>
<li>013xxxxxxxx</li>
<li>014xxxxxxxx</li>
<li>014xxxxxxxx</li>
<li>016xxxxxxxx</li>
<li>017xxxxxxxx</li>
<li>018xxxxxxxx</li>
<li>019xxxxxxxx</li>
</ul>
Example:
<pre><code>String mobileNumber =&quot;01715254815&quot;;

if(mobileNumber.matches(&quot;^(?:\\+88|88)?(01[3-9]\\d{8})$&quot;)){
 System.out.println(&quot;Yes valid&quot;);
}
</code></pre>

blocks|key|1081160|text|此正则表达式将在下面的条件下有效。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1081161|%2B880+1760+123128|unordered-list-item|1081162|%2B(%2B880)-1760-123128|1081163|%2B8801996409999|1081164|%2B8801760-123128|1081165|[%2B,'+'][\d]{7}[-,$,'+',][\d]{0,6}%7C[%2B,'+'][\d]{3}[,-,$,'+',][\d]{4}[-,$,'+',][\d]{0,6}%7C[(][(%2B,'+'][\d]{3}[)][-,$,'+'][\d]{4}\b[-,$,'+',][\d]{0,6}%7C[[%2B,'+'][\d]{3}[-,$,'+',][\d]{4}[-,$,'+',][\d]{0,6}%7C[(][(%2B,'+'][\d]{3}[)][-,$,'+'][\d]{4}\b[-,$,'+',][\d]{0,6}%7C[%2B'+'][\d]{0,13}%7C[%2B,'+'][\d]{0,7}[-,$,'+',][\d]{0,6}|code-block|syntax|javascript|1081166|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|S|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|T|8|@]|9|@]|A|$]]|$1|G|3|H|5|D|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|W|8|@]|9|@]|A|$N|O]]|$1|P|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|Q|$]]

This regex will valid following bellow condition
<ul>
<li>+880 1760 123128</li>
<li>+(+880)-1760-123128</li>
<li>+8801996409999</li>
<li>+8801760-123128</li>
</ul>
<pre><code>[+,' '][\d]{7}[-,$,' ',][\d]{0,6}|[+,' '][\d]{3}[,-,$,' ',][\d]{4}[-,$,' ',][\d]{0,6}|[(][(+,' '][\d]{3}[)][-,$,' '][\d]{4}\b[-,$,' ',][\d]{0,6}|[[+,' '][\d]{3}[-,$,' ',][\d]{4}[-,$,' ',][\d]{0,6}|[(][(+,' '][\d]{3}[)][-,$,' '][\d]{4}\b[-,$,' ',][\d]{0,6}|[+' '][\d]{0,13}|[+,' '][\d]{0,7}[-,$,' ',][\d]{0,6}
</code></pre>

blocks|key|147352|text|关于孟加拉国的电话号码，您可以使用这个/%5E(01%7C008801%7C8801%7C\%2B8801)[0-9]{9}$/|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|147353|entityMap^0|J|Z|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|$]]

for Bangladeshi phone number you can use this <code>/^(01|008801|8801|\+8801)[0-9]{9}$/</code>

I am using the following regular expression to validate an Indian phone number. 

I want optional +88 or 01 before 11 digits of phone. 

Here is what I am using:

<pre><code>string mobileNumber = "+8801000000000";
if (new Regex(@"^([01]|\+88)?\d{11}").IsMatch(mobileNumber)){
 MessageBox.Show("Mobile number is valide", "All information is required", MessageBoxButtons.OK, MessageBoxIcon.Asterisk);
}
else{
 MessageBox.Show("Mobile number is not valide", "All information is required", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
</code></pre>

How can I do it? 

UPDATE

If I write mobile no. preceding <code>01</code>, for more than 11 digit it notify validation <code>mgs(Not valid mobile no.!)</code>. Well I used, it fails when 13 digit. It alters validation mgs wrongly.

Here is my code: 

<pre><code>&lt;input type="text" placeholder="Enter bKash wallet number" 
 class="form-control" ng-model="BkashWalletNo" ng-disabled="AutoConfirmed" 
 name="BkashWalletNo" ng-pattern="/^(?:\+88|01)?\d{11}\r?$/" /&gt;
&lt;p class="help-block" ng-show="form.BkashWalletNo.$error.pattern"&gt;Not valid mobile no.!&lt;/p&gt;
</code></pre>

Validate Bangladeshi phone number with optional +88 or 01 preceeding 11 digits

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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我使用下面的正则表达式来验证一个印度电话号码。我想选择+88或01之前的11位电话。下面是我正在使用的内容：string mobileNumber = "+8801000000000";if (new Regex(@"^([01]|\+88)?\d{11}").IsMatch(mobileNumber)){    Me...

问验证孟加拉国的电话号码，并可选+88或01前面的11位数字
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问验证孟加拉国的电话号码，并可选+88或01前面的11位数字EN