How to use dart to remove all but digits from string using RegExp

Question

Can someone show me how to use dart language to remove all but digits from a string?

Tried this but it does not seems to work

input.replaceAll("\\D", "");

Answer 1

You need to use

input.replaceAll(RegExp(r'\D'), '');

See the replaceAll method signature: String replaceAll (Pattern from, String replace), from must be a Pattern class instance.

Note that r'\D', a raw string literal, is a more convenient way to define regular expressions, since regular string literals, like '\\D', require double escaping of backslashes that form regex escapes.