which_token_worker: (function to check which chars belong to which token) takes a...
In rtext: R6 Objects for Text and Data

(function to check which chars belong to which token) takes a vector of xs to check if these lie between pairs of ys and if so returning their index; assumes xs and ys are sorted; returns only the first span index which enclosing the x

1	which_token_worker(x, y1, y2)

`x`	a vector of type numeric; a number to be placed into a span
`y1`	a vector of type numeric; first element of span
`y2`	a vector of type numeric; last element of span