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记一次面试题，正则表达式(?=a)是什么意思？
source link: https://juejin.im/post/5ceb7d9df265da1b8811ba7f
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前言 不久前出去面试了一下，被问到了一个问题： 正则表达式 (?=a) 表示什么意思？ 嗯，我花了几秒钟从脑子中检索答案，然后发现对于正则表达式方面的知识有许多地方记不清了！ so，我的回答是： 我只知道 ? 号是最少匹配前面一次的意思，加个 = 号就不太
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