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POPython regex for select/extract from nested groups
primarykey
Id
20586266
data
AcceptedAnswerId
20586834
AnswerCount
3
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CommentCount
0
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CreationDate
2013-12-14T17:38:14.640
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0
LastActivityDate
2013-12-14T19:00:07.230
LastEditDate
2013-12-14T18:52:21.053
LastEditorUserId
371392
OwnerUserId
371392
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0
PostTypeId
1
Score
0
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326
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text
Body
I am trying to process a string with CHAR(int) and NCHAR(int) to convert those instances with their ASCII counter-parts. An example would be something like this: <pre><code>CHAR(124) + (SELECT TOP 1 CAST(name AS VARCHAR(8000)) FROM (SELECT TOP 1 colid, name FROM [Projects]..[syscolumns] WHERE xtype=char(85) AND id = OBJECT_ID(NCHAR(69)+NCHAR(78)+NCHAR(95)+NCHAR(69)+NCHAR(109)+NCHAR(112)+NCHAR(108)) </code></pre> Note that I don't want to do anything to VARCHAR(int), and just to the CHAR(int) and NCHAR(int) parts only. The above should translate to: |(SELECT TOP 1 CAST(name AS VARCHAR(8000)) FROM (SELECT TOP 1 colid, name FROM [Projects]..[syscolumns] WHERE xtype=U AND id = OBJECT_ID(EN_Empl) Note that any "+" on either side of CHAR(int) or NCHAR(int) should be removed. I tried the the following: <pre><code>def conv(m): return chr(int(m.group(2))) print re.sub(r'([\+ ]?n?char\((.*?)\)[\+ ]?)', conv, str, re.IGNORECASE) </code></pre> where <code>str</code>=the raw string that must be processed. Somehow, the VARCHAR(8000) is being picked up. If I tweak the regex, the "=" after xtype is going away, rather than just the space and the "+" on either side of a CHAR(int) or NCHAR(int) instance. Hope someone can pull me out of this. ADDITIONAL SAMPLE STRINGS: String <code>"char(124)+(Select Top 1 cast(name as varchar(8000)) from (Select Top 1 colid,name From [Projects]..[syscolumns] Where id = OBJECT_ID(NCHAR(69)+NCHAR(78)+NCHAR(95)+NCHAR(69)+NCHAR(109)+NCHAR(112)+NCHAR(108)))"</code> Regex: <code>r'(\bn?char\((\d+)\)(?:\s*\+\s*)?)'</code> Result: <code>"|(Select Top 1 cast(name as varchar(8000)) from (Select Top 1 colid,name From [Projects]..[syscolumns] Where id = OBJECT_ID(ENCHAR(78)+NCHAR(95)+NCHAR(69)+NCHAR(109)+NCHAR(112)+NCHAR(108)))"</code>
Tags
<python><regex><non-greedy>
Title
Python regex for select/extract from nested groups
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PostAcceptedAnswerId
1. PO
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1. This table or related slice is empty.
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1. PTQuestion
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1. USWeb User
UserOwnerUserId
1. USWeb User
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1. PO
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