Lines of src/utils.rs from check-in f5ed284f8c that are changed by the sequence of edits moving toward check-in 0f47e23e21:

                         1: use crate::Cursor;
                         2: 
                         3: use lazy_static::lazy_static;
                         4: use regex::Regex;
                         5: 
                         6: lazy_static! {
                         7: 	pub static ref RE_SPECIAL: Regex = Regex::new(r"([\-_*\[\]()~`>#+|{}\.!])").unwrap();
                         8: 	pub static ref RE_DOMAIN: Regex = Regex::new(r"^[a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)*$").unwrap();
                         9: }
                        10: 
                        11: /// `Attachment` object to store number attachment data and corresponding file name
                        12: #[derive(Debug)]
                        13: pub struct Attachment {
                        14: 	pub data: Cursor<Vec<u8>>,
                        15: 	pub name: String,
                        16: }