vendor/regex-0.2.11/examples/shootout-regex-dna-single.rs

   1 // The Computer Language Benchmarks Game
   2 // http://benchmarksgame.alioth.debian.org/
   3 //
   4 // contributed by the Rust Project Developers
   5 // contributed by TeXitoi
   6 // contributed by BurntSushi
   7
   8 extern crate regex;
   9
  10 use std::io::{self, Read};
  11
  12 macro_rules! regex { ($re:expr) => { ::regex::Regex::new($re).unwrap() } }
  13
  14 fn main() {
  15     let mut seq = String::with_capacity(50 * (1 << 20));
  16     io::stdin().read_to_string(&mut seq).unwrap();
  17     let ilen = seq.len();
  18
  19     seq = regex!(">[^\n]*\n|\n").replace_all(&seq, "").into_owned();
  20     let clen = seq.len();
  21
  22     let variants = vec![
  23         regex!("agggtaaa|tttaccct"),
  24         regex!("[cgt]gggtaaa|tttaccc[acg]"),
  25         regex!("a[act]ggtaaa|tttacc[agt]t"),
  26         regex!("ag[act]gtaaa|tttac[agt]ct"),
  27         regex!("agg[act]taaa|ttta[agt]cct"),
  28         regex!("aggg[acg]aaa|ttt[cgt]ccct"),
  29         regex!("agggt[cgt]aa|tt[acg]accct"),
  30         regex!("agggta[cgt]a|t[acg]taccct"),
  31         regex!("agggtaa[cgt]|[acg]ttaccct"),
  32     ];
  33     for re in variants {
  34         println!("{} {}", re.to_string(), re.find_iter(&seq).count());
  35     }
  36
  37     let substs = vec![
  38         (regex!("B"), "(c|g|t)"),
  39         (regex!("D"), "(a|g|t)"),
  40         (regex!("H"), "(a|c|t)"),
  41         (regex!("K"), "(g|t)"),
  42         (regex!("M"), "(a|c)"),
  43         (regex!("N"), "(a|c|g|t)"),
  44         (regex!("R"), "(a|g)"),
  45         (regex!("S"), "(c|g)"),
  46         (regex!("V"), "(a|c|g)"),
  47         (regex!("W"), "(a|t)"),
  48         (regex!("Y"), "(c|t)"),
  49     ];
  50     let mut seq = seq;
  51     for (re, replacement) in substs {
  52         seq = re.replace_all(&seq, replacement).into_owned();
  53     }
  54     println!("\n{}\n{}\n{}", ilen, clen, seq.len());
  55 }