Replicates the use of index function in SAS for logic options

Assumption is that use in filters is to only resolve true vs false Primarily for use with stream_filter and related stream_filter_convwhere functions

Usage

stream_filter_index(string1, string2)

Arguments

string1: The string to search within - can be a vector
string2: The string to search for - must have length 1

Value

boolean indicator

Author

Iain Bennett

Examples

AEACN <- c("DRUG MODIFIED", "DRUG STOPPED", "DOSE/DRUG MODIFIED")
stream_filter_index(AEACN, "DRUG MODIFIED")
#> [1]  TRUE FALSE  TRUE