Concatenation of Sets of Strings
In formal language theory and pattern matching (including regular expressions), the concatenation operation on strings is generalized to an operation on sets of strings as follows:
In this definition, the string vw is the ordinary concatenation of strings v and w as defined in the introductory section. In this context, sets of strings are often referred to as formal languages.
There is typically no explicit concatenation operator, simply juxtaposition (as with multiplication).
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