Visual basic provides the Substring method for accessing any number of characters contained in a string
A contiguous series of characters within a string is referred to as a substring in formal language theory and computer science. [Reference needed] A substring of "It was the best of times" is "the best of," for example. It was the best of times, however, is a subsequence of "Itwastimes," not a substring.
Substrings are a specific instance of prefixes and suffixes. A prefix of a string displaystyle SS is a substring that appears at the start of the string, and a suffix of a string displaystyle SS is a substring that appears at the end of the string. If there are two strings with displaystyle p and displaystyle s, then a string with displaystyle u is a substring (or factor)[1] of a string with displaystyle t.
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