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问题： https://www.zhihu.com/question/26480812 (?<=<(\w+)>).*(?=<\/\1>) 正则表达式看懂的最好方法就是一步步分开解析： 1）以 '.*' 为分界，前面括号中的内容可以划分为 ‘？<=’ 和 ‘<(\w+)>’,其中‘<(\w+)>'表示 阅读全文
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question: I wrote the following code on immutable Strings. Output: Here the value of variable a has been changed (while many say that contents of the 阅读全文
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正则表达式非常好的网站： https://www.regular-expressions.info/lookaround.html Lookahead and Lookbehind Zero-Length Assertions Lookahead and lookbehind, collective 阅读全文