Gsub Scan

gsub replaces matching text, while scan collects matches.

gsub_scan.rb

word = 
text = "red blue red"
pattern = Regexp.new(word)

matches = text.scan(pattern)
replaced = text.gsub(pattern, "item")

puts "word=#{word}"
puts "matches=#{matches.length}"
puts "replaced=#{replaced}"

word = 
text = "red blue red"
pattern = Regexp.new(word)

matches = text.scan(pattern)
replaced = text.gsub(pattern, "item")

puts "word=#{word}"
puts "matches=#{matches.length}"
puts "replaced=#{replaced}"

word = 
text = "red blue red"
pattern = Regexp.new(word)

matches = text.scan(pattern)
replaced = text.gsub(pattern, "item")

puts "word=#{word}"
puts "matches=#{matches.length}"
puts "replaced=#{replaced}"

scan `scan` returns all non-overlapping matches from a string.