stri_*_first/last_charclass - merge arg

[bartektartanus]

Now it works like this:

stri_extract_last_charclass("abc123","\\p{Nd}")
[1] "3"

and we could add merge parameter (like in extract_all function) so it could work like this:

stri_extract_last_charclass("abc123","\\p{Nd}", merge=TRUE)
[1] "123"

[gagolews]

may be. but the same for the other *charclass funs?

[bartektartanus]

Absolutely :)