Question

I am using Jquery Validation.

Currently, I have a textfield. How can I prompt an alert when user type in 0 or any other symbols as the first character in the field?

 $.validator.addMethod(
    "regex",
    function(value, element, regexp) {
        var re = new RegExp(regexp);
        return this.optional(element) || re.test(value);
    },
    "Please check your input."
 );
 $("#Textbox").rules("add", { regex: "^[a-zA-Z'.\\s]{1,40}$" })

Answer 1

Just looking at the regex, if all you want is to prevent the first character from being a zero and nothing else, it should be

$("#Textbox").rules("add", { regex: "^[^0]$" })

To exclude symbols as well you can either add them to the list of prohibited characters

$("#Textbox").rules("add", { regex: "^[^0$-/:-?{-~!"^_`\[\]]$" })

or specify the characters which are allowed. In this case, lower and uppercase letters, the numbers 1-9, an apostrophe, period or a space

$("#Textbox").rules("add", { regex: "^[a-zA-Z1-9'.\s]" })