30-seconds-of-code/snippets/toSnakeCase.md

toSnakeCase

Converts a string to snake case.

Break the string into words and combine them using _ as a separator. For more detailed explanation of this Regex, visit this Site.

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-javascript-property") -> 'some_javascript_property'
// toSnakeCase("some-mixed_string With spaces_underscores-and-hyphens") -> 'some_mixed_string_with_spaces_underscores_and_hyphens'
// toSnakeCase("AllThe-small Things") -> "all_the_smal_things"