# Strings define some of the basic arithmetic operators, plus as
# you expect, but also multiply.
p 'Stri' + 'ng'
p 'Ho ' * 3

# String brackets with a number gives us access to the byte at that
# position.
d2 = "Foo"
p d2[1]
d2[1] = 99
p d2[1]
puts "Changed str: #{d2}"

# String brackets are much more flexible than that. E.g. they let
# you extract a matching portion:
s = 'Test string'
puts "Matching portion: #{s['est']}"

# and can even be assigned to
s['est'] = 'otal'
puts "String now #{s}"

# Or, wait for it, used with Regexps!
p s[/[A-Z].t/]

# To replace numbered captures!!!
# This operates in place (i.e. modifies the receiver).
s[/([A-Z].)t/,1] = "Toas"
p s

# We can evaluate any code inside a string.
num = 5
message = "The day is long, but the night is auburn-magenta"

c = "Here is a message with #{num * 32} possible meanings: #{message}"
puts c

# match
def regtest(name)
  if name =~ /Ros(s|ie).+(B|R)a(mford|ndall)/
    puts name + " matched!"
  else
    puts name + " didn't match!"
  end
end

regtest("Ross Bamford")         # true
regtest("Rosie    Randall")     # true
regtest("Boss       Bamford")   # false
regtest("Ross+++Bandall")       # true
regtest("Rob Randall")          # false