title: find the numerical value exist in the Expression C#
body: <p>How do I find:</p>
  
  <p><code>string str="(120)(1500)x";</code></p>
  
  <p>How to find out in the event that the string contains:</p>
  
  <p><code>string str1="()()X";</code></p>
  
  <p>I then have to print:</p>
  
  <p><code>console.writeline("str1 doesnt contain a numerical");</code></p>