Explanation:* and + are metacharacters for repetition of data. 9. Which of the following function is used for searching text strings by means of regular expression ?
A. grepd
B. grepl
C. gepexpr
D. All of the Mentioned
Answer:A
Explanation:* and + are metacharacters for repetition of data. 9. Which of the following function is used for searching text strings by means of regular expression ?
A. grepd B. grepl C. gepexpr D. All of the Mentioned
Explanation:grep , grepl , regexpr , gregexpr and regexec search for matches to argument pattern within each element of a character vector. 10. merge function is used for merging data frames.