Question

假设以下字符串

s = '\nThe model layer\nDjango provides an abstraction layer (the “models”) for structuring and manipulating the data of your Web application. Learn more about it below:\n\nModels: Introduction to models | Field types | Indexes | Meta options | Model class\nQuerySets: Making queries | QuerySet method reference | Lookup expressions\nModel instances: Instance methods | Accessing related objects\nMigrations: Introduction to Migrations | Operations reference | SchemaEditor | Writing migrations\nAdvanced: Managers | Raw SQL | Transactions | Aggregation | Search | Custom fields | Multiple databases | Custom lookups | Query Expressions | Conditional Expressions | Database Functions\nOther: Supported databases | Legacy databases | Providing initial data | Optimize database access | PostgreSQL specific features\n'

按findall检索标题：

In [17]: chapter = re.findall(r'\n.+:', s)
In [18]: chapter
Out[18]:
['\nDjango provides an abstraction layer (the “models”) for structuring and manipulating the data of your Web application. Learn more about it below:',
 '\nModels:',
 '\nQuerySets:',
 '\nModel instances:',
 '\nMigrations:',
 '\nAdvanced:',
 '\nOther:']

效果很好，但finditer

In [19]: chap = re.finiter(r'\n.+:', s)
In [21]: [ i for i in chap]
Out[21]:
[<_sre.SRE_Match object; span=(16, 162), match='\nDjango provides an abstraction layer (the “mode>,
 <_sre.SRE_Match object; span=(163, 171), match='\nModels:'>,
 <_sre.SRE_Match object; span=(247, 258), match='\nQuerySets:'>,
 <_sre.SRE_Match object; span=(322, 339), match='\nModel instances:'>,
 <_sre.SRE_Match object; span=(384, 396), match='\nMigrations:'>,
 <_sre.SRE_Match object; span=(482, 492), match='\nAdvanced:'>,
 <_sre.SRE_Match object; span=(670, 677), match='\nOther:'>]

比较他们的索引[0]

'\nDjango provides an abstraction layer (the “models”) for structuring and manipulating 
the data of your Web application. Learn more about it below:',

[<_sre.SRE_Match object; span=(16, 162), 
match='\nDjango provides an abstraction layer (the “mode>,

finditer未能删除已完成的段落。

参考官方文档，对匹配长度没有限制。6.2. re — Regular expression operations — Python 3.6.4rc1 documentation

问题是什么？

Answer 1

如果您注意到，第一个项目跨越索引16到162，长度为146个字符。 finditer有效，但其表示（即其__repr__()方法的输出）正如此处所示，正如kindall的评论中所述。

'match`的长度限制使用＆＃39; finditer＆＃39;

1 个答案: