The result is such that all(startsWith(str,determinePrefix(str))) is TRUE.
Usage
determinePrefix(str, split = "-", collapse = "-")
Arguments
- str
a character vector
- split
the token to use for strsplit instead of '-', this should be character(0) if you want to split letter by letter
Value
the prefix common to all entries of str.
Details
By default, the strings are assumed to be '-' separated words, and
a series of words is found to be thje prefix if all entries start
with that set of words.
The normal case is c("abc-1","abc-2b","abc-2a") maps to "abc"