Javascript-Reference-Code/regExp.html at master · kugesh-Rajasekaran/Javascript-Reference-Code · GitHub

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<html>
    <head>
        <script type="text/javascript">

            function fun(){
                var a=document.getElementById("inp").value;

                var b=document.getElementById("but");
var r=/[a-c]bc/;
if(r.test(a)){
    document.getElementById("lab").style.visibility="hidden";
    alert("founded");
}
else{
    document.getElementById("lab").style.visibility="visible";
}
            }


            </script>


    </head>
    <body>
        <input id="inp" placeholder="enter_Text">
        <label id="lab" style="color: red;visibility:hidden">Invalid Username</label>
        <button id="but" onclick="fun()" type="button">click me</button>
    </body>
</html>