Function unre 

pub fn unre(subject: &str) -> String

Strips reply prefixes from email subjects.

Removes internationalized reply/forward prefixes: Re:, Fwd:, AW: (German), SV: (Swedish), Odp: (Polish), Antw: (Dutch), etc.

Security

For performance in O(n²) threading loops, extremely long subjects are truncated to MAX_SUBJECT_THREAD_LENGTH before regex processing.

Examples

use hypermail::string_utils::unre;
assert_eq!(unre("Re: Hello"), "Hello");
assert_eq!(unre("RE: Re: Fwd: Hello"), "Hello");
assert_eq!(unre("AW: Diskussion"), "Diskussion");