"substring." YourDictionary, n.d. Web. 11 October 2018. <http://www.yourdictionary.com/substring>.
substring. (n.d.). Retrieved October 11th, 2018, from http://www.yourdictionary.com/substring
substring - Computer Definition
A subset of an alphanumeric field or variable. The substring function in a programming language is used to extract the subset; for example, the programming expression substr(prodcode,4,3) extracts characters 4, 5 and 6 out of a product code field or variable.