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Only alphabets, numbers and Period to be allowed in textbox

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User-73514677 posted

Hi.

I have 2 asp.net text box in which I want to check that only alphabets, numbers and period character can be used. If any other special character is entered/pasted , it should not be allowed.

How to achieve this in JavaScript ?

I have this regex but not sure, how to call it for both the textbox in keypress and how to restrict other special characters

var regexp1 = new RegExp("^[0-9A-Za-z.]+$");

Thanks
Tuesday, February 12, 2019 12:44 PM

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User1520731567 posted

Hi venkatzeus,

According to your descriptiom,I think you could use the below regex:

^(?![0-9]+$)(?![a-zA-Z]+$)[0-9A-Za-z\.]*$

?![0-9]+$ : Only numbers are not allowed

?![a-zA-Z]+$ : Only alphabets are not allowed

[0-9A-Za-z\.]* : allow alphabets, numbers and Period

how to call it for both the textbox in keypress and how to restrict other special characters

I make a simple demo,you could refer to:

<input class="Inputtext" type="text" onkeypress="runn()" />
<span id="regexVaildate" style="color:#C00; display:none"></span>


    <script>
        function runn() {
            var f1c = $(".Inputtext").val();
            var validator = new RegExp('^(?![0-9]+$)(?![a-zA-Z]+$)[0-9A-Za-z\.]*$');
            var runner = validator.test(f1c);
            if (runner) {
                $("#regexVaildate").css("display", "inline");
                $("#regexVaildate").text("right!");
            }

            else {
                $("#regexVaildate").css("display", "inline");
                $("#regexVaildate").text("wrong!");
            }
        }
    </script>

How it works:

Best Regards.

Yuki Tao

Marked as answer by Anonymous Thursday, October 7, 2021 12:00 AM

Wednesday, February 13, 2019 6:11 AM

Answered by:

Only alphabets, numbers and Period to be allowed in textbox

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