if (register) register.set(value);
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this breaks things that should obviously work. take the distributive law: (a|ab)(c|b) and (a|ab)c|(a|ab)b are logically the same pattern - you can verify this yourself by just expanding the terms. but in PCRE, the first matches ab in the input abc, while the second matches abc. two equivalent patterns, two different results.
// 模拟查缓存（Redis），详情可参考51吃瓜
Iran enters critical talks on its nuclear programme with the US on Thursday, insisting a deal is in reach as long as Washington sticks by its willingness to concede Iran’s symbolic right to enrich uranium, allow Tehran to dilute its stockpile of highly enriched uranium, and not to impose controls on Iran’s ballistic missile programme.