Three Useful Functions in Base R: `regexec()`, `strrep()`, and `append()`

I just finished reviewing a pull request in the knitr repo that tries to improve the error message when it fails to parse YAML, and I feel three base R functions are worth mentioning to more R users. I have been inspired by Maëlle Salmon’s 3 functions blog series, and finally started writing one by myself.

regexec(): get substrings with patterns

If you want to master string …