Add extract_acronym

Cargo.toml

@@ -7,3 +7,5 @@ edition = "2021"
 
 [dependencies]
 clap = {version = "3.1.17", features = ["derive"]}
+regex = "1.5"
+lazy_static = "1.4.0"

src/main.rs

@@ -1,6 +1,8 @@
 use std::fs::{File, read_to_string};
 use std::io::{BufWriter, Error, Write};
 use clap::Parser;
+use lazy_static::lazy_static;
+use regex::Regex;
 
 fn main() -> Result<(), Error> {
     let args = Args::parse();
@@ -33,6 +35,19 @@ fn sort_range(lowerbound: usize, upperbound: usize, list: &mut Vec<&str>) {
     list[lowerbound..upperbound].sort_unstable();
 }
 
+fn extract_acronym(line: &str) -> Option<(&str, &str, &str)> {
+    lazy_static! {
+        static ref RE: Regex = Regex::new(r"\{(\w+)\}\[(\w+)\]\{(.+)\}").unwrap();
+    }
+    let caps = RE.captures(line);
+    match caps {
+        Some(c) => Some((c.get(1).unwrap().as_str(),
+                         c.get(2).unwrap().as_str(),
+                         c.get(3).unwrap().as_str())),
+        _ => None
+    }
+}
+
 /// Sorts the acronym block of a .tex file
 #[derive(Parser, Debug)]
 #[clap(author, version, about, long_about = None)]
@@ -43,3 +58,4 @@ struct Args {
 }
 
 
+