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func (opt *Option) ArgFloat32Var(val *float32) error
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2026-03-03 00:00:00:03014311710http://paper.people.com.cn/rmrb/pc/content/202603/03/content_30143117.htmlhttp://paper.people.com.cn/rmrb/pad/content/202603/03/content_30143117.html11921 外交部发言人就伊朗局势答记者问
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]).