The book begins with an introduction to regular expressions, a text pattern methodology, and quantitative text summaries, all of which are fundamental tools of text analysis. Then, it was built on this foundation to explore: Probability and texts, including bag-of-word model of information retrieval techniques such as TF-IDF similarity measure Concordance lines and corpus linguistics Multivariate techniques such as correlation, principal component analysis, and clustering perl module, Germany , and permutation tests Each chapter is devoted to a single key topic, and the author carefully and seriously to introduce mathematical concepts as they arise, allowing readers to learn they go without having to refer to additional books.