string-manipulation

• More string utilities (e.g. regex functions)
• Formatting functions (echo 3.1415 | map format "{:.2f}")

Are there any cheat sheets of stringi available? Like this one of stringr: http://edrub.in/CheatSheets/cheatSheetStringr.pdf

It would be more efficient to have a cheat sheet since R base, stringr, and stringi have different but similar types of syntax, which could be confusing some times.