regex for matching 1 to 4 caps alpha, followed by 1 to 4 digits seems to
fail for 5 alpha (tho not 5 digits)

see examples below, 1, 3 and 4 give expected response, but 2 does not.
Using "http://myregexp.com/" gives expected results (example 2 does not
match)

# 1
ruby -v -e 'puts( /^[A-Z]{1,4}[0-9]{1,4}$/ =~ "ABCD1234" )'
ruby 1.9.2p290 (2011-07-09) [i386-mingw32]
0

# 2
ruby -v -e 'puts( /^[A-Z]{1,4}[0-9]{1,4}$/ =~ "ABCDE1234" )'
ruby 1.9.2p290 (2011-07-09) [i386-mingw32]
1

# 3
ruby -v -e 'puts( /^[A-Z]{1,4}[0-9]{1,4}$/ =~ "ABCD12345" )'
ruby 1.9.2p290 (2011-07-09) [i386-mingw32]

# 4
ruby -v -e 'puts( /^[A-Z]{1,4}[0-9]{1,4}$/ =~ "ABCDE12345" )'
ruby 1.9.2p290 (2011-07-09) [i386-mingw32]

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