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苹果熊

#1 Created at ... [Delete] [Delete and Lock User]

alert('欢迎'+arr.sort().join(',').replace(/,(?!.*,)/g, '和') + '同学！');

CantyWei

#2 Created at ... [Delete] [Delete and Lock User]

好屌，这是正则表达式吗？

风袭6729

#3 Created at ... [Delete] [Delete and Lock User]

这个看不懂啊

weaming

#4 Created at ... [Delete] [Delete and Lock User]

像正则又看不懂，谁来解释下 （了解一点正则）

仗剑书生com

#5 Created at ... [Delete] [Delete and Lock User]

,(?!.,) ,找到 , , , 三个 从第一个,之后启用 零宽度负预测先行断言(?!exp)，断言此位置的后面不能匹配表达式exp 同时使用.匹配任意数量的单字符 也就是第二个和第三个,号 第二个,号可以不被匹配，之后的符合条件全部被匹配 也就是第三个，被匹配 然后被替换成'和'

海韵棠风红叶

#6 Created at ... [Delete] [Delete and Lock User]

这个果然够吊，看来得好好学习一下正则表达式了啊

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