Check for a Pattern in the Vector in R Programming - grepl() Function Last Updated : 24 Jun, 2020 Comments Improve Suggest changes Like Article Like Report grepl() function in R Language is used to return the value True if the specified pattern is found in the vector and false if it is not found. Syntax: grepl(pattern, string, ignore.case=FALSE) Parameters: pattern: regular expressions pattern string: character vector to be searched ignore.case: whether to ignore case in the search. Here ignore.case is an optional parameter as is set to FALSE by default. Example 1: Python3 # R program to illustrate # grepl function # Initializing a character vector str <- c("GFG", "gfg", "Geek", "Geeks") # Calling the grepl() function to # find whether any instance(s) of # ‘GF’ and 'G' are present in the string grepl('GF', str, ignore.case ="True") grepl('G', str, ignore.case ="True") Output: [1] TRUE TRUE FALSE FALSE [1] TRUE TRUE TRUE TRUE Example 2: Python3 # R program to illustrate # grepl function # Initializing a character vector str <- c("GFG", "gfg", "Geek", "Geeks") # Calling the grepl() function to # find whether any instance(s) of # ‘gfg’ and 'Geek' are present in the string grepl('gfg', str) grepl('Geek', str) Output: [1] FALSE TRUE FALSE FALSE [1] FALSE FALSE TRUE TRUE Comment More infoAdvertise with us Next Article Check for a Pattern in the Vector in R Programming - grepl() Function K Kanchan_Ray Follow Improve Article Tags : R Language R Vector-Function R String-Functions Similar Reads Check for the Existence of a Vector Object in R Programming - is.vector() Function is.vector() function in R Language is used to return TRUE if the given vector is of the specified mode having no attributes other than names. It returns FALSE otherwise. Syntax: is.vector(x, mode = "any") Parameters: x: R object mode: character string naming an atomic mode or "list" or "expression" 1 min read Find position of a Matched Pattern in a String in R Programming – grep() Function grep() function in R Language is used to search for matches of a pattern within each element of the given string. Syntax: grep(pattern, x, ignore.case=TRUE/FALSE, value=TRUE/FALSE)Parameters: pattern: Specified pattern which is going to be matched with given elements of the string. x: Specified str 1 min read Seek a Match for the Pattern in the String in R Programming - pmatch() Function pmatch() function in R Language is used to seek match for the pattern passed as argument. It returns the strings that begin with the pattern being searched. Syntax: pmatch(pat, string, nomatch) Parameters: pat: pattern vector to be searched string: vector to be matched nomatch: return when no match 1 min read Find String Matches in a Vector or Matrix in R Programming - str_detect() Function str_detect() Function in R Language is used to check if the specified match of the substring exists in the original string. It will return TRUE for a match found otherwise FALSE against each of the element of the Vector or matrix. Note: This function uses 'stringr' Library. Syntax: str_detect(string 2 min read Matching of patterns in a String in R Programming - agrep() Function agrep() function in R Language is used to search for approximate matches to pattern within each element of the given string. Syntax: agrep(pattern, x, ignore.case=FALSE, value=FALSE)Parameters:pattern: Specified pattern which is going to be matched with given elements of the string. x: Specified st 1 min read Like