StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POpython "re" package, strange phenomenon with "raw" string
primarykey
Id
6500521
data
AcceptedAnswerId
6500711
AnswerCount
3
ClosedDate
CommentCount
4
CommunityOwnedDate
CreationDate
2011-06-28T00:52:59.937
FavoriteCount
1
LastActivityDate
2011-06-28T01:41:16.557
LastEditDate
2011-06-28T01:41:16.557
LastEditorUserId
368821
OwnerUserId
534238
ParentId
0
PostTypeId
1
Score
5
ViewCount
521
LastEditorDisplayName
text
Body
I am seeing the following phenomenon, couldn't seem to figure it out, and didn't find anything with some search through archives: if I type in: <pre><code>>>> if re.search(r'\n',r'this\nis\nit'): ... print 'found it!' ... else: ... print "didn't find it" ... </code></pre> I will get: <pre><code>didn't find it! </code></pre> However, if I type in: <pre><code>>>> if re.search(r'\\n',r'this\nis\nit'): ... print 'found it!' ... else: ... print "didn't find it" ... </code></pre> Then I will get: <pre><code>found it! </code></pre> (The first one only has one backslash on the r'\n' whereas the second one has two backslashes in a row on the r'\\n' ... even this interpreter is removing one of them.) I can guess what is going on, but I don't understand the official mechanism as to why this is happening: in the first case, I need to escape two things: both the regular expression and the special strings. "Raw" lets me escape the special strings, but not the regular expression. But there will never be a regular expression in the second string, since it is the string being matched. So there is only a need to escape once. However, something doesn't seem consistent to me: how am I supposed to ensure that the characters REALLY ARE taken literally in the first case? Can I type rr'' ? Or do I have to ensure that I escape things twice? On a similar vein, how do I ensure that a variable is taken literally (or that it is NOT taken literally)? E.g., what if I had a variable tmp = 'this\nis\nmy\nhome', and I really wanted to find the literal combination of a slash and an 'n', instead of a newline? Thanks! Mike
Tags
<python><regex>
Title
python "re" package, strange phenomenon with "raw" string
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USmgiuca
UserOwnerUserId
1. USMike Williamson
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
2. PO
 singulars
 PostTypePostTypeId
 PTAnswer
3. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. VO
 singulars
 PostPostId
 POpython "re" package, strange phenomenon with "raw" string
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
2. VO
 singulars
 PostPostId
 POpython "re" package, strange phenomenon with "raw" string
 UserUserId
 This table or related slice is empty.
 VoteTypeVoteTypeId
 VTUpMod
3. VO
 singulars
 PostPostId
 POpython "re" package, strange phenomenon with "raw" string
 UserUserId
 USmiku
 VoteTypeVoteTypeId
 VTFavorite
CommentsPostId

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.