Grep(pattern, string) returns by default a list of indices. Prior to analysing the textual data, always clean the documents and parse them into a structured or semi-structured collection which will enable computer-aided analysis. Most original documents are not represented with a structure and they may contain elements which do not carry any information, such as stop words, punctuation and white space characters. Text Analysis is a broad term to describe processing of text and natural language documents for structures and meaningful descriptions. 8 Answers Sorted by: 150 Filtering out multiple lines with grep: Put these lines in filename.txt to test: abc def ghi jkl grep command using -E flag with a pipe between tokens in a string: grep -Ev 'defjkl' filename.txt prints: abc ghi egrep using -v flag with pipe between tokens surrounded by parens: egrep -v ' (defjkl)' filename.

In text cleaning, to find, find and remove, and find and replace strings, we write search patterns in regular expressions, commonly abbreviated to regex or regexp). Text can be considered as a collection of documents and a document can be parsed into strings.

Before performing analysis or building a learning model, data wrangling is a critical step to prepare raw text data into an appropriate format. Formal textual content is a mixture of words and punctuations while online conversational text comes with symbols, emoticons and misspellings.

Grep regex one of two strings