regex-redux Matz's Ruby #2 program

# The Computer Language Benchmarks Game
# https://salsa.debian.org/benchmarksgame-team/benchmarksgame/
#
# regex-dna program contributed by jose fco. gonzalez
# optimized & parallelized by Rick Branson
# optimized for ruby2 by Aaron Tavistock
# converted from regex-dna program
# array not dictionary by Isaac Gouy

seq = STDIN.readlines.join
ilen = seq.size

seq.gsub!(/>.*\n|\n/,"")
clen = seq.length

MATCHERS = [
  /agggtaaa|tttaccct/,
  /[cgt]gggtaaa|tttaccc[acg]/,
  /a[act]ggtaaa|tttacc[agt]t/,
  /ag[act]gtaaa|tttac[agt]ct/,
  /agg[act]taaa|ttta[agt]cct/,
  /aggg[acg]aaa|ttt[cgt]ccct/,
  /agggt[cgt]aa|tt[acg]accct/,
  /agggta[cgt]a|t[acg]taccct/,
  /agggtaa[cgt]|[acg]ttaccct/
]

threads = MATCHERS.map do |f|
  Thread.new do
    Thread.current[:result] = "#{f.source} #{seq.scan(f).size}"
  end
end

threads.each do |t|
  t.join
end

match_results = threads.map do |t|
  t[:result]
end

threads.each do |t|
  t.join
end

# ruby 1.8.7: to iterate in-order use array not dictionary
[
[/tHa[Nt]/, '<4>'], [/aND|caN|Ha[DS]|WaS/, '<3>'], [/a[NSt]|BY/, '<2>'], 
[/<[^>]*>/, '|'], [/\|[^|][^|]*\|/, '-']
].each { |f,r| seq.gsub!(f,r) }

puts "#{match_results.join("\n")}\n\n#{ilen}\n#{clen}\n#{seq.length}"
    

NOTES:
64-bit Ubuntu quad core
ruby 1.8.7 (2008-08-11 patchlevel 72) [x86_64-linux]
 
So old that I haven't been able to get rubygems to work
no backport, no gmp


Sun, 17 May 2020 02:45:24 GMT

COMMAND LINE:
/usr/bin/ruby regexredux.mri-2.mri 0 < regexredux-input5000000.txt

PROGRAM OUTPUT:
agggtaaa|tttaccct 356
[cgt]gggtaaa|tttaccc[acg] 1250
a[act]ggtaaa|tttacc[agt]t 4252
ag[act]gtaaa|tttac[agt]ct 2894
agg[act]taaa|ttta[agt]cct 5435
aggg[acg]aaa|ttt[cgt]ccct 1537
agggt[cgt]aa|tt[acg]accct 1431
agggta[cgt]a|t[acg]taccct 1608
agggtaa[cgt]|[acg]ttaccct 2178

50833411
50000000
27388361