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云计算开发实例:Python3使用正则表达式提取字符串中的 URL
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简介...
如何在Python3中判断字符串长度,首云计先给定一个字符串,里面包含 URL 地址,需要算开我们使用正则表达式来获取字符串的 URL。
实例
?发实: 说明:
匹配 x 但是不记住匹配项。这种括号叫例:作非捕获括号,使得你能够定义与正则表达式运算符一Py起使用的子表达式。看看这个例子 /(?:footh){1,2}/。如果表达式是 /foo&on#123;1,2}/,{1,2} 将只3使应用于 'foo' 的最后一个字符 'o'。如用正果使用非捕获括号,则 {1,2} 会应用则表于整个 'foo' 单词。
执行以上代码输出结果达式为:
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