fixed=TRUE in regular expressions where appropriateInvoking a regular expression engine is overkill for cases when the search pattern only involves static patterns.
fixed_regex_linter()best_practices, efficiency, readability
NB: for stringr functions, that means wrapping the pattern in stringr::fixed().
NB: This linter is likely not able to distinguish every possible case when a fixed regular expression is preferable, rather it seeks to identify likely cases. It should never report false positives, however; please report false positives as an error.
linters for a complete list of linters available in lintr.