英文:
Extracting an optional project name in a fully optional pattern
问题
- 如果字符串中存在 "projects"，则捕获 "x" 并存储在名为 "project_name" 的组中。
- 如果字符串中不存在 "projects"，则捕获整个字符串。
使用的正则表达式是 "\S*(projects\/(?<project_name>\w+))?"
但是 "x" 没有被捕获并存储在一个捕获组中。不确定您的正则表达式有什么问题。
英文:
I have this string "https://url/projects/x/flow/" and i want:
- if projects is existing in the string, capture x in a group named project_name
- if projects not existing in the string, then capture the whole string
The regex i am using is "\S*(projects\/(?<project_name>\w+))?"
But x is not captured and stored in a capturing group. Not sure what is wrong with my regex.
Your help is appreciated
答案1
得分: 1
你可以使用以下正则表达式：
^(?:\S*?(projects\/(?<project_name>\w+)))?.*
查看正则表达式演示。
详细信息：
^- 字符串的开始(?:\S*?(projects\/(?<project_name>\w+)))?- 一个可选的非捕获组：\S*?- 任何零个或多个非空白字符，尽可能少(projects\/(?<project_name>\w+))- 第1组：projects/+ 之后一个或多个单词字符，捕获到 "project_name" 组
.*- 字符串的其余部分。
英文:
You can use
^(?:\S*?(projects\/(?<project_name>\w+)))?.*
See the regex demo.
Details:
^- start of string(?:\S*?(projects\/(?<project_name>\w+)))?- an optional non-capturing group:\S*?- any zero or more non-whitespace chars, as few as possible(projects\/(?<project_name>\w+))- Group 1:projects/+ one or more word chars after it captured into "project_name" group
.*- the rest of the string.
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