title: how to check for some character in the string?
body: <p>i have a string..</p>
  
  <p>I am entering some characters from user using that string.</p>
  
  <p>Now i want to check that in that string "a" is there or not?</p>
  
  <p>can anyone tell me how to do this?</p>
  
  <p>that "a" can be anywhere in the string.</p>