Funcons that use regular expressions regexprpattern

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: in an HTML document •  create variables from informa+on found in text •  clean and transform text into a uniform format, resolving inconsistencies in format between files •  mine text by trea+ng documents directly as data •  “scrape” the web for data •  A regular expression (aka regex or regexp) is a paMern that describes a set of strings. •  This set may be finite or infinite, depending on the par+cular regexp. We say the regexp “matches” each element of that set. •  For example, the regexp grey|gray ! matches both grey and gray, whereas ^A.* matches any string star+ng with capital A. •  The idea is similar to wildcards in UNIX, but with many more possibili+es. Syntax: • Literal characters are matched only by the character itself. • A character...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern