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Or it seems like I have to write my own method? (to keep the DHA untouched):
ruby-1.9.2-p180 :001 > s = 'omega-3 (DHA)'
=> "omega-3 (DHA)"
ruby-1.9.2-p180 :002 > s.capitalize
=> "Omega-3 (dha)"
ruby-1.9.2-p180 :003 > s.titleize
=> "Omega 3 (Dha)"
ruby-1.9.2-p180 :005 > s[0].upcase + s[1..-1]
=> "Omega-3 (DHA)"
My apologies if my answer is just rubbish (I don’t do ruby).
But I believe I’ve found an answer for you:
Ruby equivalent of PHP's ucfirst() function