vcard 0.4.13

A pure Rust implementation of vCard based on RFC 6350.
Documentation 
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use std::borrow::Cow;

use regex::Regex;

lazy_static! {
    static ref NEW_LINE_RE: Regex = Regex::new(r"\n\r|\r\n|\n").unwrap();
    static ref COMMA_RE: Regex = Regex::new(r",").unwrap();
    static ref SEMICOLON_RE: Regex = Regex::new(r";").unwrap();
    static ref BACKSLASH_RE: Regex = Regex::new(r"\\").unwrap();
    static ref TAB_RE: Regex = Regex::new("\x09").unwrap();
}

pub(crate) fn escape_new_line(s: &str) -> Cow<'_, str> {
    NEW_LINE_RE.replace_all(s, "\\n")
}

pub(crate) fn escape_tab(s: &str) -> Cow<'_, str> {
    TAB_RE.replace_all(s, "    ")
}

pub(crate) fn escape_comma(s: &str) -> Cow<'_, str> {
    COMMA_RE.replace_all(s, "\\,")
}

pub(crate) fn escape_semicolon(s: &str) -> Cow<'_, str> {
    SEMICOLON_RE.replace_all(s, "\\;")
}

pub(crate) fn escape_backslash(s: &str) -> Cow<'_, str> {
    BACKSLASH_RE.replace_all(s, "\\\\")
}