Malte Grosser

https://stackoverflow.com/questions/51857207/convert-upper-case-words-to-title-case/57309589#57309589

In the first example the hyphen is too much and in the second one both of the two first abbreviations are parsed incorrectly. 

(possibly) allow for completely user defined parsing

2

It should be possible to add user defined parsing functionality. To not break the existing parsig_option modus via integers, there could be an alternative via usage of named character vectors....

Doesn't work by default e.g. ```r > to_any_case("bla bll-lla fafeaef", parsing_option = 0, sep_in = "-") [1] "bla_bll-lla_fafeaef" ```

Currently no idea how they should behave. (Maybe `stringr::fixed()` would be a good idea). However, this should occur: ```r to_any_case("bla", abbreviations = "\\d") [1] " l l_b_r r l_a" ```

As already thought of in #46 #57 and #89 it might be possible to reduce the dependencies to only base R. Currently the main challenges would be * stringr offers...

parsing_opion 1: * upper_case and following lower case letters: `Ullll` should be matched * upper case letters followed by a change from uper to lower case letters: `UUUU`Ulll parsing_option 3:...

```r to_any_case("too_cooL", parsing_option = 0, abbreviations = "coo") [1] "too l lcoor r l" ``` And also with `seo_out` ```r to_any_case("too_cooL", parsing_option = 0, abbreviations = "coo" ,sep_out = "_")...