In this article, we will see how to restrict special characters using jquery regex. Here, we will learn how to create regex validation for a special character that is not allowed in the input textbox.

    Using regular expression you can restrict the special character in the input fields. If you want to not be allowed special characters in input fields then you can use regex for validation.

    So, let's see special characters not allowed using jquery regex and jquery validation for special characters not allowed.

    In this example, we will check regex validation on keyup event.

$(function () {
   $("form :input[type='text']").on("keyup", function (e) {
        var inputTextId = $('#' + this.id);
        var inputText = inputTextId.val();

        var errorFor = this.id;
        if (!isValidChar(inputText)) {
            $('#' + this.id).val('').valid();       
            setTimeout(function () { replaceErrorMsg(errorFor); }, 100);
        }
    }); 
}); 

function isValidChar(str) {
    return !/[~`!#$%\^&*+=\-\[\]\\';,/{}|\\":<>\?]/g.test(str);
}

function replaceErrorMsg(errorFor) {
   $("label[for='" + errorFor + "'].help-block").html("Input is Invalid.");
}

    In this example, we will check validation using a special characters code.

<input type="text" id="name" >

$("#name").keypress(function(e) {
	$("#error_sp_msg").remove();
	var k = e.keyCode,
			$return = ((k > 64 && k < 91) || (k > 96 && k < 123) || k == 8 || k == 32  || (k >= 48 && k <= 57));
      if(!$return) {
      	$("<span/>",{
        	"id" : "error_sp_msg",
          "html" : "Special characters not allowed"
        }).insertAfter($(this));
      	return false;
      }
      
})

    In this example, we will use a validation jquery CDN file. So, add the following code to your file. Check the documentation of the jquery validation plugin.

    HTML:

<form id="myform">
    <input type="text" name="title" />
    <br/><br/>
    <input type="submit" />
</form>

    jQuery:

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/jquery.validate.js"></script>
<script>
$(document).ready(function() {

  $('#myform').validate({ // initialize the plugin
    rules: {
      title: {
        required: true,
        alphanumeric: true
      }
    },
    submitHandler: function(form) { // for demo
      alert('valid form submitted'); // for demo
      return false; // for demo
    }
  });

});
</script>

    Output:

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