To count the number of occurrences of a pattern in each element of a character vector.

To subset a character vector based on the presence of a pattern.

To detect if a pattern is present in each element of a character vector.

To replace all occurrences of a matched pattern in a character vector with a new value.

To replace matched patterns in a character vector with new values.

To trim whitespace from the beginning and/or end of each string in a character vector.

To extract or replace substrings from a character vector.

To count the number of characters in a character vector.

To format numeric or date-time objects for pretty printing.

To format and concatenate strings with the help of a format specification.

To extract or replace substrings from a character vector.

To convert characters in a character vector to uppercase.

To convert characters in a character vector to lowercase.

To extract or replace matched substrings based on the output of functions like regexpr or gregexpr.

To find the position of the first occurrence of a pattern in a character vector, similar to regexpr.

To find the positions of all occurrences of a pattern in a character vector.

To find the position of the first occurrence of a pattern in a character vector.

To search for a pattern in a character vector and return a logical vector indicating whether the pattern is found in each element.

To measure the execution time of an expression or function.

To search for a pattern in a character vector and return the indices of matching elements.