正規表現を使った文字列の加工

reg.rb

a = "foo bar baz"
puts a
puts a.scan(/f+/)

puts "========" 
b = "foo 10 bar 20 baz 30"
puts b
puts b.scan(/\w+/)

puts "========" 
arr = ["cat", 123, "#dog", "mouse", "12hoge", "hoge12", "ccat", "hogec"]
# pattern = '[A-Za-z].*'
pattern = '^c.*'
puts arr.grep(/#{pattern}/)

puts "========" 
body = ['<td colspan="1" rowspan="1" style="padding: 10px; border-bottom: solid 1px #ddd;">2013/02/13 21:27</td></tr>', 'hoge']
pattern = '<.*?>'
temp = body.reject{ |e| e =~ /#{pattern}/}
puts temp