How to replace Backslash '\' with double Backslash in Dart?

Question

How to replace a Single Backslash '\' in a String with double Backslash '\' ?

I tried this, but its not working.

main(){
String string = "back\slash back\slash back\slash back\slash";
String replaced = string.replaceAll(RegExp(r'\\'), '\\\\');
print(replaced);
}

Gizmo

Do you get an error? What output do you get? – Liard

No error , just I was unable to accomplish what I needed. – Gizmo

Answer 1

The problem is that the string string does not contain any \

It would either need to be

String string = r"back\slash back\slash back\slash back\slash";

or

String string = "back\\slash back\\slash back\\slash back\\slash";

In your example there also is no need for RegExp. Just

String replaced = string.replaceAll(r'\', r'\\');

would do as well.

Abiogenesis

This has to do with how Dart handles raw strings, for further explanation see How to Create A Raw String In Dart – Ailyn