selfteaching / selfteaching/selfteaching-python-camp
【自学内容】 关于正则表达式 (er)+ 的疑惑
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Description
《自学是门手艺》正则表达式部分有这样一段代码：
from IPython.core.interactiveshell import InteractiveShell
InteractiveShell.ast_node_interactivity = "all"
import re
str = 'error wonderer severeness'
pttn = r'(er)+'
re.findall(pttn, str)
运行结果是：
['er', 'er', 'er']
这点我不理解，（er）+中的+表示一个或多个，那 wonderer 这个单词中的 erer 就应该被匹配出来啊，为什么结果不是 ['er', 'erer', 'er']？
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
No repository file is named; start by running the shown Python snippet with re.findall and inspect how the (er)+ pattern is matched in the string. Done means clarifying the explanation so the expected result for “wonderer” is unambiguous.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- documentation
- Issue type
- Documentation
- Difficulty
- 1/5
- Estimated time
- Under an hour
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 42/100