The gregexpr() function in R is used to return a substring matching the pattern passed to the function.
gregexpr(pattern, text, ignore.case=FALSE, perl=FALSE,
fixed=FALSE, useBytes=FALSE, extract=FALSE)
The gregexpr() function takes the following parameter values:
pattern (required): This is the character string to be matched in the input character vector.text (required): This is the character vector that has the desired character string to be sorted.ignore.case (optional): This takes a boolean value TRUE or FALSE indicating whether the patch pattern matching (if TRUE) is case sensitive, or ignored during matching (if FALSE.)perl (optional): This takes a boolean value TRUE or FALSE to indicate whether Perl-compatible regular expressions are being used or not.fixed (optional): This takes a boolean value TRUE or FALSE to indicate whether the pattern is a string to be matched as is (if TRUE) or overrides all conflicting arguments (if FALSE).useBytes (optional): This takes a boolean value TRUE or FALSE to indicate whether the matching is done byte-by-byte (if TRUE), rather than character-by-character (if FALSE).extract (optional): This takes a boolean value TRUE or FALSE to indicate whether the matching substrings should be extracted and returned or not.# creating a character vectormypattern <- c("JBDSGKJKLJKGFSKLJH","FDLAKLGISRI")# implementing the gregexpr() functitongregexpr("DSG", mypattern, useBytes = TRUE)
mypattern containing the pattern to match.gregexpr() function and print the result to the console.