/^a-eg-h/.match(‘f’) gives null in Ruby

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As has been mentioned in the comments, your pattern is incorrect. It appears that you’re attempting to use a character class, but have neglected to include the surrounding square brackets. Your pattern, as it currently stands, will only match on strings that start with the literal text a-eg-h. The pattern you want is:

/[^a-eg-h]/

Additionally, attempting to match the string j with this pattern will fail and return nil in Ruby, as the string does not match the pattern. A better way to go about this would be something like:

match = /[^a-eg-h]/.match(str)
if (match)
    do_something()
end

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