#RegExp for a alphanumeric value not starting with 0, can have no special characters other that _ or -

script.js

//validation check for sku of a product

//alphanumeric

var regExp = "/^[^0][A-Za-z0-9_-]{3,50}$/";

// ^              start of string
// [^0]           1st char will not be 0
// [A-Za-z0-9_-]  A or B ... Z or a or b or ... z or 0 or 1 or ... 9 or underscores(_) or hyphen/dash (-)
// {3,50}         length between 3-50
// $              end of string