04. Anchors begins and ends with
In some cases, you'll need to specify that a string starts and/or ends with certain characters. For example, if you were reading from an ouput, and had to match if it reads "success", you couldn't just write a regex that matches "success", as "not success" and "success did not occur" would also be valid matches.
Begins and Ends with
To specify that a string should strictly start or end with certain character, we can use the hat (^) or dollar sign ($).
^zip- Match all strings that start with
zip. zip$- Match all strings that end with
zip. ^z..i.p$- Match all strings that start with
z, has any two characters then ani, then another character, and ends withp.
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Algorithms are the procedures that software programs use to manipulate data structures. Besides clear and simple example programs, the author includes a workshop as a small demonstration program executable on a Web browser. The programs demonstrate in graphical form what data structures look like and how they operate.
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Introduction to Algorithms uniquely combines rigor and comprehensiveness. The book covers a broad range of algorithms in depth, yet makes their design and analysis accessible to all levels of readers. The algorithms are described in English and in a pseudocode designed to be readable by anyone who has done a little programming.
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