Indices of member(s) in vector.

indexOf finds indices of value(s) in a given vector.

sealso<< regexpr

indexOf(x, v, regexp = TRUE)

Arguments

x	value(s) to be searched for in vector v
v	vector
regexp	If TRUE, x of character type is interpreted as a regular expressions.

Examples

# numeric examples
indexOf(1,c(2,3,1,4))
#> [1] 3
indexOf(10,c(2,3,1,4))
#> integer(0)

# character examples
indexOf(c('a','b'),c('a','c','b','d','ab'))
#> [1] 1 3
# using regular expressions (enabled by default):
indexOf(c('a.*','b'),c('a','c','b','d','ab'))
#> [1] 1 5 3
# disabling regular expressions:
indexOf(c('a*','b'),c('a','c','b','d','ab'),regexp=FALSE)
#> [1] 3