Converts a string to snake case.
Use String.replaceAllMapped()
to break the string into words and String.toLowerCase()
to convert each one to lowercase, using a RegExp
.
Use String.replaceAll()
to replace invalid separator characters (-
and spaces) with underscores.
代码实现
String toSnakeCase(String str) {
return str
.replaceAllMapped(
RegExp(
r'[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+'),
(Match m) => "${m[0].toLowerCase()}")
.replaceAll(RegExp(r'(-|\s)+'), '_');
}
使用样例
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'