Question

我正在尝试解析'bit.ly/KATlrT'

之外的链接asdfs asdf as dfa sdf a bit.ly/KATlrT f sf sd f dsfdsa

这是正则表达式使用但它不匹配？

bit?/S+

Answer 1

(bit\.ly\/\S+)
^\ /^^\/^^\/^^
| | ||| ||| ||
| | ||| ||| |`- End first capture group
| | ||| ||| `-- Match 1 or more of previous (any non-space character)
| | ||| ||`---- Match any non-space character
| | ||| |`----- Match '/' literally because of previous escape character
| | ||| `------ Escape next special character
| | ||`-------- Match 'ly' literally
| | |`--------- Match '.' literally because of previous escape character
| | `---------- Escape next special character
| `------------ Match 'bit' literally
`------------- Start first capture group

<强> See it in action.

您在问题中提供的说明：

bit?/S+
\/^^^^^
| |||||
| ||||`- repeat previous ('S') 1 or more times
| |||`-- match 'S' literally
| ||`--- this is not escaped, and will cause problems
| |`---- previous is optional ('t')
| `----- match 't' literally 
`------- match 'bi' literally

如果您想了解有关正则表达式的更多信息，www.regular-expressions.info是一个很好的资源，Regexr或Rubular是测试正则表达式的绝佳工具。

Answer 2

由于我不懂语言，我将发布Java正则表达式的答案（主要基于Perl正则表达式）。有很多语言遵循或多或少的Perl的正则表达式语法。

"bit\\.ly/[a-zA-Z]+"

Answer 3

它可能不匹配，因为您忘记了\S，因此它会查找文字S。在大多数语言中，您还需要.而不是?。

尝试bit\.\S+或bit\.ly\/\S+等

解析字符串中的twitter短链接

3 个答案: