str_[starts|ends]

[hammer]

Maybe not worth the API bloat, but I think regex-phobic users might like to have str_starts(string, prefix) as an alias for str_detect(string, "^prefix") and str_ends(string, suffix) as an alias for str_detect(string, "suffix$").

For some evidence of need, Does R have function startswith or endswith like python? has quite a few upvotes.

I know we have startsWith and endsWith in base R; I just prefer to stay in the tidyverse!

[gagolews]

note stringi has stri_endswith and stri_startswith

[hadley]

I like the idea, and implementation will be straightforwar

[jonthegeek]

Claiming this issue.