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By Schwarz H.-U.

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Any character % Escape character for magic characters and non-alphanumeric characters + Repetition operator - Repetition operator * Repetition operator ? Repetition operator [ Defines sets ^ Represents the complement of the set $ Represents the end of a string Parentheses encapsulate the pattern to capture Patterns Patterns are used to match strings, and they are very powerful. Think about them as simplified regular expressions in Lua. Character classes and captures are used in combination with patterns that support greedy and non-greedy matching to allow programmers to perform advanced string matching, substitution, and extraction.

Html#books. 47SVN) at the time of writing this book. However, the basic principles and features described here certainly apply to older and newer versions, since we will not use any deprecated functions. You may skip this chapter if you are familiar with the following concepts in Lua: • • • • • • • • Flow control structures Data types String handling Common data structures I/O operations Co-routines Metatables Other special quirks about Lua related to comments, memory management, semantics, and so on Lua Fundamentals Quick notes about Lua Now we will cover other concepts in Lua.

It preserves existing data and only allows appending at the end of the file. This is read mode. open (filename [, mode]) If it fails, it will return nil and the corresponding error message (like most Lua functions).

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