How can I block : from input

I have following code . I want to block : from input screen. How can I block : Please advice

       bValid = bValid && checkRegexp(corno, /^((?!\/|\\).)*$/g, '<?php echo get_lng($_SESSION["lng"], "E0034");/*Error: PO Number can not contain space, / , \\*/ ?>');
        bValid = bValid && checkspace(corno, /\s/, '<?php echo get_lng($_SESSION["lng"], "E0034");/*Error: PO Number can not contain space, / , \\*/ ?>');