It is possible to define and use regular expressions with every programming language. Although the use of regular expressions between programming languages is somewhat different, it is often the same.
The dot (.) is used for matching any of characters. When dot is used as a character, the escape character should be used: \. A question mark (?) is used for defining that the preceding character is optional. When it needs to be used as a question mark, an escape character should be used: \?.
Get R Web Scraping Quick Start Guide now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
Get Mark Richards’s Software Architecture Patterns ebook to better understand how to design components—and how they should interact.
Dive in for free with a 10-day trial of the O’Reilly learning platform—then explore all the other resources our members count on to build skills and solve problems every day.
Start your free trial Become a member now