"button is-small is-light copyCode" title="Copy"><span class="icon is-small"><i class="fa fa-copy"></i></span><span>Copy</span></button></div><div class="codePanel hljs"><pre xml:space="preserve"><code class="language-cs">ValidationPattern = @"(?i)^[a-z]+$"</code></pre></div></div><a href="https://learn.microsoft.com/en-us/dotnet/standard/base-types/regular-expression-language-quick-reference" target="_blank" rel="noopener noreferrer">Regular expression quick reference</a><br /><a href="https://learn.micros