Use this patch file and it should work for you.

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
  <sitecore>
    <settings>    
      <setting name="ItemNameValidation">
        <patch:attribute name="value">^.*$</patch:attribute>
      </setting>
   </settings>
  </sitecore>
</configuration>

According to this regex .* matches any character. And you will be able to create items. Here is the screenshot.

Hope this helps.

Use this patch file and it should work for you.

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
  <sitecore>
    <settings>    
      <setting name="ItemNameValidation">
        <patch:attribute name="value">^.*$</patch:attribute>
      </setting>
   </settings>
  </sitecore>
</configuration>

According to this regex .* matches any character. And you will be able to create items. Here is the screenshot.

But OOTB you can use the Display Name to show the name like this.

Hope this helps.

Use this patch file and it should work for you.

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
  <sitecore>
    <settings>    
      <setting name="ItemNameValidation">
        <patch:attribute name="value">^.*$</patch:attribute>
      </setting>
   </settings>
  </sitecore>
</configuration>

And you will be able to create items. Here is the screenshot.

Hope this helps.

Use this patch file and it should work for you.

<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
  <sitecore>
    <settings>    
      <setting name="ItemNameValidation">
        <patch:attribute name="value">^.*$</patch:attribute>
      </setting>
   </settings>
  </sitecore>
</configuration>

According to this regex .* matches any character. And you will be able to create items. Here is the screenshot.

Hope this helps.