Programming Language Pragmatics, Fourth Edition
Programming Language Pragmatics, Fourth Edition
4th Edition
ISBN: 9780124104099
Author: Michael L. Scott
Publisher: Elsevier Science
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Chapter 2.1, Problem 2CYU

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Three operations used to build complex regular expressions from simpler regular expressions:

  • Concatenation
    • The term concatenate means combining a string in a series without any spaces.
    • The “ο” is the concatenation symbol. It provides a way to construct larger strings from smaller strings.
    • With the use of empty string, represented as “ϵ” the strings are concatenated. The empty string serves as both a left and right idempotent for concatenation.
  • Alternation
    • Small finite sets are conveniently denoted by listing their elements

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