JavaScript/regulorExpersion.html at master · vishal-vaish/JavaScript · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <input type="text" id="input">
    <button onclick="submit()">Submit</button>
    <div id="result"></div>
</body>
</html>
<script>
    function submit(){
    let input=document.getElementById("input").value;
    //let pattern=/vishal/;    //string to search(it is case sensitive)
    //let pattern=/vishal/i;   //to make it case Insensitive
  // let pattern=/^vishal$/;     //when only want particulator word only, it is also case sensitive
   //  let pattern=/^[a-z][A-Z][0-9]$/;       //only all character between a to z(1 time only)
  // let pattern=/^[a-zA-Z0-9]+$/;        //atleast one or more
   //let pattern=/^[a-zA-Z0-9]*$/;        //atleast zero or more
   let pattern=/^[a-zA-Z0-9@#$]+$/;        //to add special character


    let check=pattern.test(input);//check is present or not give output in true and false
    if(check) {
        document.getElementById("result").innerText="Match is found"
    }else{
        document.getElementById("result").innerText="Match not found"
    }
    }
</script>