➜
This issue tracker has been migrated to GitHub,
and is currently read-only.
For more information,
see the GitHub FAQs in the Python's Developer Guide.
Created on 2020-04-12 07:52 by dchron, last changed 2022-04-11 14:59 by admin.
| Files | ||||
|---|---|---|---|---|
| File name | Uploaded | Description | Edit | |
| re.Scanner.txt | dchron, 2020-04-12 08:07 | |||
| Messages (2) | |||
|---|---|---|---|
| msg366226 - (view) | Author: Karthikeyan Singaravelan (xtreak) *  |
Date: 2020-04-12 08:03 | |
Please add a description of the issue you are facing with a simple script of the behavior. |
|||
| msg366249 - (view) | Author: Karthikeyan Singaravelan (xtreak) * |
Date: 2020-04-12 14:06 | |
Copy paste of the contents in the text file
In the re module there is an experimental feature called Scanner.
Some unexpected behavior was found while working with it.
Here is an example:
>>> re.Scanner([('\w+=(\d+);', lambda s,g: s.match.group(1))]).scan('x=5;')
(['5;'], '')
The obvious error is the semicolon returned via capturing group 1.
Adding a dummy rule at the beginning, seems to solve that issue:
>>> re.Scanner([('z', None), ('\w+=(\d+);', lambda s,g: s.match.group(1))]).scan('x=5;')
(['5'], '')
Adding a capturing group around \w+ also returns the correct answer:
>>> re.Scanner([('z', None), ('(\w+)=(\d+);', lambda s,g: s.match.group(1))]).scan('x=5;')
(['x'], '')
But then, if I ask for the second group, the problem appears again:
>>> re.Scanner([('z', None), ('(\w+)=(\d+);', lambda s,g: s.match.group(2))]).scan('x=5;')
(['5;'], '')
|
|||
| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:59:29 | admin | set | github: 84440 |
| 2020-04-12 14:06:10 | xtreak | set | messages: + msg366249 |
| 2020-04-12 08:07:40 | dchron | set | files: + re.Scanner.txt |
| 2020-04-12 08:03:36 | xtreak | set | nosy:
+ xtreak messages: + msg366226 |
| 2020-04-12 07:52:00 | dchron | create | |