re = /(^#[0-9A-Fa-f]{6}$)|(^#[0-9A-Fa-f]{3,4}$)|(^#[0-9A-Fa-f]{8}$)/m
str = '// good case
#000
#123
#999
#AAA
#aaa
#abc
#FFF
#0000
#9999
#AAAA
#aaaa
#abcd
#FFFF
#ffff
#000000
#456789
#999999
#AAAAAA
#aaaaaa
#abcdef
#FFFFFF
#ffffff
#00000000
#12345678
#99999999
#AAAAAAAA
#aaaaaaaa
#abcdefcc
#FFFFFFFF
#ffffffff
#00123456
//bad case
##
#0
#1
#F
#f
#12
#AB
#ae
#aaaaa
#fffff
#aaaah
#aaaaaaa
#0000000
#ffffhij
#h000000
#aaaaaaai
#000k0123
#asdfasfa
'
# Print the match result
str.scan(re) do |match|
puts match.to_s
end
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Ruby, please visit: http://ruby-doc.org/core-2.2.0/Regexp.html