romulus 0.3.0

a stream editor like sed
Documentation 
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use regex::Regex;

pub fn to_regex(pat: String, flags: String) -> Result<Box<Regex>, String> {
    let prepend = if flags.is_empty() {
        String::new()
    } else {
        format!("(?{})", flags)
    };

    match regex::Regex::new(&format!("{}{}", prepend, pat)) {
        Ok(regex) => Ok(Box::new(regex)),
        Err(_) => Err(format!("Can not create from /{}/{}", pat, flags)),
    }
}