Matching sub sequences

Matching sub-sequences

re-seq returns a lazy seq of all of the matches. The elements of the seq are the results that re-find would return.

(re-seq #"s+" "Helloween")

Most common word

re-seq is used in the most common word challenge to split a string into individual words.

Extract from Project Guttenburg the text of The importance of being Earnest by Oscar Wilde. This returns a string of the whole book.

The book is broken down into a collection of individual words using re-seq and a regular expression pattern.

The collection of words is converted to lower case, so that The and the are not counted as separate words. frequencies returns a collection of tuples, each tuple being a word and a value representing how often it occurs. This collection is sorted by the value in descending order to show the word with the most occurrences at the top.

(->> (slurp "http://www.gutenberg.org/cache/epub/844/pg844.txt")
     (re-seq #"[a-zA-Z0-9|']+")
     (map #(clojure.string/lower-case %))
     frequencies
     (sort-by val dec))

TODO: add link to complete example.