alphanumeric validation JavaScript JS

Alphanumeric validation in JavaScript is used to make sure that all the characters entered in the specified field must be any alphabet (A-Z or a-z) or any number (0-9).

Regular Expression:

/^[0-9a-zA-Z]+$/

Example

<!DOCTYPE html>
<html lang="en">
<head>
<script> 
function lettersNumbersCheck(name)
{
   var regEx = /^[0-9a-zA-Z]+$/;
   if(name.value.match(regEx))
     {
      return true;
     }
   else
     {
     alert("Please enter letters and numbers only.");
     return false;
     }
}    
</script> 
</head>
<body>
<div class="mail">
<h2>JavaScript Letters Numbers Validation</h2>
<form name="form1" action="#"> 
Name: <input type='text' name='name'/></br></br>
<input type="submit" name="submit" value="Submit" onclick="lettersNumbersCheck(document.form1.name)"/>
</form>
</div>
</body>
</html>
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