title: Regular Expression For Alphanumeric String With At Least One Alphabet Or Atleast One Numeric In The String
body: <p>To test one alphanumeric string we usually use the regular expression <code>"^[a-zA-Z0-9_]*$"</code> (or most preferably <code>"^\w+$"</code> for C#). But this regex accepts numeric only strings or alphabet only strings, like <code>"12345678"</code> or <code>"asdfgth"</code>. </p>
  
  <p>I need one regex which will accept only the alphanumeric strings that have <strong>at-least one alphabet and one number</strong>. That is to say by the regex <code>"ar56ji"</code> will be one of the correct strings, not the previously said strings.</p>
  
  <p>Thanks in advance.</p>