toSnakeCase

Converts a string to snake case.

Break the string into words and combine them adding _ as a separator, using a regexp.

const toSnakeCase = (str) =>
  str &&
  str
    .match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g)
    .map((x) => x.toLowerCase())
    .join("_");

toSnakeCase("camelCase"); // 'camel_case'
toSnakeCase("some text"); // 'some_text'
toSnakeCase("some-mixed_string With spaces_underscores-and-hyphens"); // 'some_mixed_string_with_spaces_underscores_and_hyphens'
toSnakeCase("AllThe-small Things"); // "all_the_small_things"
toSnakeCase(
  "IAmListeningToFMWhileLoadingDifferentURLOnMyBrowserAndAlsoEditingSomeXMLAndHTML"
); // "i_am_listening_to_fm_while_loading_different_url_on_my_browser_and_also_editing_some_xml_and_html"