如何编写regex以从semvar中提取补丁版本

ktca8awb 于 2023-02-17 发布在其他

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我尝试使用regex从一些semvar中提取v1.2.3的修补程序版本
我有一些正则表达式可以匹配v1.2.部分，但我很难得到另一部分，3（我实际上想要回来）
我使用^v\d+\.\d+\.来选择第一个零件。
我尝试使用负前瞻，然后使用(?!(v\d+\.\d+\.)).*选择它之后的所有内容，但这似乎只是返回v之后的所有内容，而不是group之后的所有内容
任何指示将非常感谢，谢谢！

regex

来源：https://stackoverflow.com/questions/75446093/how-do-i-write-regex-to-pull-patch-version-out-of-semvar

1条答案

按热度按时间

pbpqsu0x1#

In this special case:

'^(?<=v\d\.\d\.)[[:alnum:]]+'

The regular expression matches as follows:

Node	Explanation
`^`	start of string
`(?<=`	look behind to see if there is:
`v`	v
`\d`	digits (0-9)
`\.`	.
`\d`	digits (0-9)
`\.`	.
`)`	end of look-behind
`[[:alnum:]]+`	any character of: letters and digits (1 or more times (matching the most amount possible))

A more generic solution than works with any length of digits

'^v\d+\.\d+\.\K.[[:alnum:]]+'

The regular expression matches as follows:

Node	Explanation
`^`	start of string
`v`	v
`\d+`	digits (0-9) (1 or more times (matching the most amount possible))
`\.`	.
`\d+`	digits (0-9) (1 or more times (matching the most amount possible))
`\.`	.
`\K`	resets the start of the match (what is `K` ept) as a shorter alternative to using a look-behind assertion: look arounds and Support of K in regex
`[[:alnum:]]+`	any character of: letters and digits (1 or more times (matching the most amount possible))

Check man tr | grep -FA1 '[:' for a POSIX character classes like [[:alnum:]]

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如何编写regex以从semvar中提取补丁版本

1条答案

In this special case:

The regular expression matches as follows:

A more generic solution than works with any length of digits

The regular expression matches as follows:

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