<div>
why not just <br />

<pre><code id="code-20-42886796-1">^[mM0-9]*$</code></pre>
?<br />
What was the intention to use that \u2098 ?<br />
<br />
Here is a tester for your expession to play with:<br />
<a href="https://www.regextester.com/?fam=109915" rel="ugc">https://www.regextester.com/?fam=109915</a>
</div>


why not just


^[mM0-9]*$

?
What was the intention to use that \u2098 ?

Here is a tester for your expession to play with:
https://www.regextester.com/?fam=109915 [https://www.regextester.com/?fam=109915]

<div>
I @zc2, your solution not work. I use like this in js:<br />

<pre><code id="code-20-42886801-1">function isCE(str){
                          var re = new RegExp(&quot;^[mM0-9]*$&quot;);
                          if (re.test(str)) {
                              return true;
                          } else {
                              return false;
                          }
                      }</code></pre>
If I write &quot;11&quot;, &quot;1000&quot;, etc it work, but if I use &quot;M1&quot;, &quot;Mm&quot;, don't work!<br />
I am very basic in RE!<br />
<br />
Regards, JC
</div>


I @zc2, your solution not work. I use like this in js:


function isCE(str){
                          var re = new RegExp("^[mM0-9]*$");
                          if (re.test(str)) {
                              return true;
                          } else {
                              return false;
                          }
                      }

If I write "11", "1000", etc it work, but if I use "M1", "Mm", don't work!
I am very basic in RE!

Regards, JC

Webmaster

Pedro Chagas

<div>
What are those &quot;M&quot; characters you are entering? Are they ASCII or from some others character set?
</div>


What are those "M" characters you are entering? Are they ASCII or from some others character set?

<div>
<div class="content wysiwyg-content">
Hi E's,<br />
I create this regular expression:
<blockquote>
&quot;^([0-9\u2098\s]*)$&quot;
</blockquote>
The objective is just allow the character M or m, and/or numbers from 0 to 9 (ex: m1; m99, 991, mMM10) , but unfortunately don't work.<br />
What I do wrong?<br />
<br />
The best regards,<br />
JC
</div>
</div>


Hi E's,
I create this regular expression:"^([0-9\u2098\s]*)$"
The objective is just allow the character M or m, and/or numbers from 0 to 9 (ex: m1; m99, 991, mMM10) , but unfortunately don't work.
What I do wrong?

The best regards,
JC

What is wrong in Regular Expression?

A regular expression ("regex") is a sequence of characters that define a search pattern, mainly for use in pattern matching with strings, or string matching, i.e. "find and replace"-like operations. Regular expression processors are found in several search engines, search and replace dialogs of several word processors and text editors, and in the command lines of text processing utilities, such as sed and AWK. Many programming languages provide regular expression capabilities, some built-in, for example Perl, JavaScript, Ruby, AWK, and Tcl, and others via a standard library, for example .NET languages, Java, Python and C++ (since C++11). Most other languages offer regular expressions via a library.

Regular Expressions

Web development includes all aspects of presenting content on intranets and the Internet, including delivery development, protocols, languages and standards, server software, browser clients, databases and multimedia generation.

Web Development

PHP is a widely-used server-side scripting language especially suited for web development, powering tens of millions of sites from Facebook to personal WordPress blogs. PHP is often paired with the MySQL relational database, but includes support for most other mainstream databases. By utilizing different Server APIs, PHP can work on many different web servers as a server-side scripting language.

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.

JavaScript

Web development can range from developing the simplest static single page of plain text to the most complex web-based internet applications, electronic businesses, and social network services using a wide variety of languages and standards, including the familiar HTML, JavaScript and jQuery, ASP and ASP.NET, PHP, ColdFusion, CSS, PHP, Flex and Flash, but also the implementation of a broad list of standards including XML, WSDL, SSDL, VoiceXML and many more.