for example, the regex [a-zA-Z] only cares about two kinds of characters: letters and everything else. so instead of individually taking derivatives for 52 alphabet characters a..z, A..Z, we can conclude from the start that there are only two kinds of characters we care about: letters ([a-zA-Z]) and non-letters ([^a-zA-Z]).
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When it comes to displays, the gap is more noticeable than it looks on paper. Both phones feature a Super Retina XDR OLED panel with 460 ppi and standard Apple perks like True Tone, Wide Color (P3), and Haptic Touch. But the similarities start to fade fast.