Practical Text Mining with Perl (Wiley Series on Methods and by Roger Bilisoly

By Roger Bilisoly

Provides readers with the tools, algorithms, and capacity to accomplish textual content mining tasks
This e-book is dedicated to the basics of textual content mining utilizing Perl, an open-source programming device that's freely on hand through the web (www.perl.org). It covers mining rules from a number of perspectives--statistics, facts mining, linguistics, and knowledge retrieval--and presents readers with the capacity to effectively whole textual content mining initiatives all alone.
The publication starts off with an creation to typical expressions, a textual content development technique, and quantitative textual content summaries, all of that are basic instruments of studying textual content. Then, it builds upon this starting place to discover: * likelihood and texts, together with the bag-of-words version * info retrieval thoughts equivalent to the TF-IDF similarity degree * Concordance traces and corpus linguistics * Multivariate concepts corresponding to correlation, valuable parts research, and clustering * Perl modules, German, and permutation assessments
each one bankruptcy is dedicated to a unmarried key subject, and the writer conscientiously and thoughtfully introduces mathematical ideas as they come up, permitting readers to benefit as they move with no need to consult extra books. The inclusion of various workouts and worked-out examples additional enhances the book's student-friendly structure.
Practical textual content Mining with Perl is perfect as a textbook for undergraduate and graduate classes in textual content mining and as a reference for quite a few execs who're attracted to extracting info from textual content records.

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Additional info for Practical Text Mining with Perl (Wiley Series on Methods and Applications in Data Mining)

Example text

However, certain characters have special meanings in regexes, for example, the question mark means zero or one instance of the preceding character. To match a literal question mark in a text, one has to use an escaped version , which is done by placing a backslash in front of the question mark as follows: \?. However, to include this character in a range of values, the escaped version is not needed, so [? 1 means either a question mark or an exclamation point. Conversely, a hyphen is a special symbol in a range, so [a-zl means only the lowercase letters and does not match the hyphen.

This program is an effective regex testing tool, and, fortunately, it is not hard to write. 1 performs the above steps. pl. Perl is case sensitive, so do not change from lower to uppercase or the reverse. Once Perl is installed on your computer, you need to find out how to use your computer's command line interface, which allows the typing of commands for execution by pressing the enter key. Once you do this, type the statement below on the command line and then press the enter key. The output will appear below it.

For example, Poe sometimes wrote a year as "18--" in his short stories. But such special cases are detectable by regexes, and then a decision on what to do can be made by the researcher. For example, the following code finds all instances of 11--11, and notes the nonstandard uses, which means not having a letter or whitespace adjacent to the front and the back of the dash. 24 TEXT PATTERNS $ l i n e = "It was 18--, e a r l y April--some snow s t i l l l i n g e r e d . 5 Code to search for -- and to decide if it is between two words or not.

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