javascript - Check input for 4 numbers and 2 letters with jQuery -


i have text <input> maxlength="6" want check if first 4 characters numbers , last 2 letters.

i have code:

$("input[id='post']").keyup(function count() {    //what goes here? });

but don't know how go on further.

you can use regex this

$("input[id='post']").keyup(function count() {     var input = this.value;     var regex = new regexp(/^[0-9]{4}[a-z]{2}$/i);     console.log(regex.test(input)); });

[0-9]{4} - checks 4 digits between 0-9.

[a-z]{2} - checks 2 letters between a-z. i flag @ end makes check case-insensitive.


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