In formal language theory, the empty string, also known as the empty word or null string, is the unique string of length zero. == Formal theory == Formally, a string is a finite, ordered sequence of characters such as letters, digits or spaces.
In formal language theory, the empty string, also known as the empty word or null string, is the unique string of length zero. == Formal theory == Formally, a string is a finite, ordered sequence of characters such as letters, digits or spaces.
Source: Wikipedia "Empty string" · CC BY-SA 4.0
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