JavaScript Program to Check First Character of Entered String is Uppercase or not Using Regular Expression

JavaScript Program to Check First Character of Entered String is Uppercase or not Using Regular Expression

Write a JavaScript program to check first character of entered string is uppercase or not using regular expression.



Source Code
<html>
<head>
    <title>Regular expression - Checking for First letter capital</title>
    <script>
        function checkUpper(txt)
        {
            var re = /^[A-Z]/

            if(re.test(txt.value))
                alert("String's first character is uppercase")
            else
                alert("String's first character is not uppercase")
        }
    </script>
</head>
<body>
Enter some text <input type="text" id="txt" onblur="checkUpper(this)"/>
<body>
</html>
Output