Check for a Pattern in the Vector in R Programming – grepl() Function
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:
str < - c( "GFG" , "gfg" , "Geek" , "Geeks" )
grepl( 'GF' , str , ignore.case = "True" )
grepl( 'G' , str , ignore.case = "True" )
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Output:
[1] TRUE TRUE FALSE FALSE
[1] TRUE TRUE TRUE TRUE
Example 2:
str < - c( "GFG" , "gfg" , "Geek" , "Geeks" )
grepl( 'gfg' , str )
grepl( 'Geek' , str )
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Output:
[1] FALSE TRUE FALSE FALSE
[1] FALSE FALSE TRUE TRUE
Last Updated :
24 Jun, 2020
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