Rx
Rx
The Posix Basic Regular Expression language is a notation for describing textual patterns. Regexps are typically used by comparing them to a string to see if that string matches the pattern, or by searching within a string for a substring that matches.
This chapter introduces the Posix regexp notation. This is not a formal or precise definition of Posix regexps -- it is an intuitive and hopefully expository description of them.
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