Regular Expressions 101

1st Alternative(\w+)::

Group 1(\w+)

\w+any word character, repeated at least once

::the literal text ::

2nd Alternative(?:library|require|requireNamespace)$\"?(\w+)\"?$

Non-Capturing Group(?:library|require|requireNamespace)

1st Alternativelibrary

librarythe literal text library (case sensitive)

2nd Alternativerequire

requirethe literal text require (case sensitive)

3rd AlternativerequireNamespace

requireNamespacethe literal text requireNamespace (case sensitive)

\(the literal ( (40₁₀ / 50₈ / 28₁₆)

\"?optionally matches the literal " (34₁₀ / 42₈ / 22₁₆)

Group 2(\w+)

\w+any word character, repeated at least once

\"?optionally matches the literal " (34₁₀ / 42₈ / 22₁₆)

\)the literal ) (41₁₀ / 51₈ / 29₁₆)

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(\w+)::|(?:library|require|requireNamespace)\(\"?(\w+)\"?\)

New

capturethis::dontcapturethis
library(capturethis)
require(capturethis)
requireNamespace(capturethis)