Validate a field and raise error according to length, character types, etc.

validate.js

function validateCheck(displayNameID, formFieldMsgId) {
    var displayName = $("#" + displayNameID).val();
    var MINLENGTH = 1;
    var MAXLENGTH = 128;
    var allowedLetters = /^[0-9a-zA-Z-_]+$/;
    var lenDisplayName = displayName.length;

    $("#" + formFieldMsgId).empty();
    if(lenDisplayName < MINLENGTH || displayName == undefined || displayName == null || displayName == "") {
        $("#" + formFieldMsgId).html(i18next.t("create_form.validate.warning.less_minimum_length", { value: MINLENGTH}));
        return false;
    }

    return isCellNameValid(displayName, formFieldMsgId);
};

function isCellNameValid(str, formFieldMsgId) {
    var validCellName = /^([a-zA-Z0-9]([a-zA-Z0-9\-\_]){0,127})?$/g;
    var MAXLENGTH = 128;
    var multibyteChar = /[^\x00-\x7F]+/g;
    var startWithAllowedSymbols = /^[-_]/;
    if (str.match(validCellName)) {
        // cell name is valid
        return true;
    } else if (str.length > MAXLENGTH) {
        $("#" + formFieldMsgId).html(i18next.t("create_form.validate.warning.exceed_maximum_length", { value: MAXLENGTH}));
        return false;
    } else if (str.match(multibyteChar)) {
        $("#" + formFieldMsgId).html(i18next.t("create_form.validate.warning.multibyte_not_allowed"));
        return false;
    } else if (str.match(startWithAllowedSymbols)) {
        $("#" + formFieldMsgId).html(i18next.t("create_form.validate.warning.cannot_start_with_symbol"));
        return false;
    } else {
        $("#" + formFieldMsgId).html(i18next.t("create_form.validate.warning.unsupported_symbols"));
        return false;
    }
};