) 中 +号的作用

chenyanlin_1983 · May 11, 2017 · Last by chenyanlin_1983 replied at May 11, 2017 · 1131 hits

p " a\t b\n c".split(/\s/)=====》["", "a", "", "b", "", "c"]
p " a\t b\n c".split(/\s+/)====》["", "a", "b", "c"]

请问 + 号的作用只是匹配第一个空字符串？

wootaw #1 May 11, 2017

是匹配一个或多个连续空字符的意思

chenyanlin_1983 #2 May 11, 2017

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有 + 号就是匹配一个没 + 号就是匹配多个咯，3Q

wootaw #3 May 11, 2017

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反了，你的理解

chenyanlin_1983 #4 May 11, 2017

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chenyanlin_1983 #5 May 11, 2017

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p"1,2,,3,4,,".split(',',-4)，请问下这个负号代表啥意思呢

chenyanlin_1983 #6 May 11, 2017

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了解了正无穷

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