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Introduction to Text Mining

An overview of text mining tools and techniques.

str_replace(string, pattern, replacement)

str_replace() will match a pattern within a string and replace it with a new string specified by the user. Note: str_replace will only replace the first matched pattern in the string. To match all patterns in a string, use str_replace_all(). 

Arguments: 

string: the string or character object you want to run the function on. 

pattern: the pattern to search the string for. (should be contained in quotation marks: "pattern").

replacement: the string you would like to replace the matched pattern with. (should be contained in quotation marks: "replacement"). 

str_replace_all(string, pattern, replacement)

str_replace() will match a pattern all specified patterns within a string and replace it with a new string specified by the user.

Arguments: 

string: the string or character object you want to run the function on. 

pattern: the pattern to search the string for. (should be contained in quotation marks: "pattern").

replacement: the string you would like to replace the matched pattern with. (should be contained in quotation marks: "replacement"). 

String Case Functions

The stringr package contains a number of functions that allow users to change the case type of character objects. Below you will find a list of these functions. 

str_to_lower(string): Transform all characters in a string to lower-case letters. 

str_to_upper(string): Transform all characters in a string to upper-case letters. 

str_to_title(string): Capitalize the first character in a string following a punctuation mark.