To return a value of TRUE, (1) the first letter of abb must match the
first letter of full, (2) all letters of abb must exist in full, and
(3) those letters of abb must be in the same order as they appear in
full.
Usage
is_abbrev(abb, full)
Value
logical; whether abb is potential abbreviation of full
is_abbrev(abb = "BRX", full = "BRONX")
is_abbrev(abb = state.abb, full = state.name)
is_abbrev(abb = "NOLA", full = "New Orleans")
is_abbrev(abb = "FE", full = "Iron")