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    <p>You have three issues:</p> <ol> <li>You need to use <code>flags=re.IGNORECASE</code> and not just <code>re.IGNORECASE</code> in <a href="http://docs.python.org/2/library/re.html#re.sub" rel="nofollow">re.sub</a>. That is a keyword argument.</li> <li>You need to use <code>\b</code> to find the word boundary. </li> <li>You should not use <code>str</code> as a name since you will overwrite the built-in by the same name</li> </ol> <p>This works:</p> <pre><code>import re tgt='''\ 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))''' pat=r'(\bn?char\((\d+)\)(?:\s*\+\s*)?)' def conv(m): return chr(int(m.group(2))) print re.sub(pat, conv, tgt, flags=re.IGNORECASE) </code></pre> <p>More completely:</p> <pre><code>import re tgt='''\ 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))''' pat=r'(\bn?char\((\d+)\)(?:\s*\+\s*)?)' def conv(m): return chr(int(m.group(2))) print re.sub(r''' ( # group 1 \b # word boundary n?char # nchar or char \( # literal left paren (\s*\d+\s*) # digits surrounded by spaces \) # literal right paren (?:\s*\+\s*)? # optionally followed by a concating '+' ) ''' , conv, tgt, flags=re.VERBOSE | re.IGNORECASE) </code></pre> <p>Prints:</p> <pre><code>|(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) </code></pre>
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    1. POPython regex for select/extract from nested groups
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    1. COI used your expression and I think I am a step closer! However, if you look at the new sample I have provided in my question alonside the regex you provided, you will observe that a series of nchar(int) instances separated by "+" seems to convert only the first instance and the remaining instances are preserved as is. Any suggestions? NCHAR(69) was replaced with "E" but everything else stayed the same.
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    2. CODid you use keyword `re.sub(..., flags=re.IGNORECASE)`?
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    3. COYes I used the IGNORECASE flag. @Tim Peters' answer worked for me. I think the difference between your answer and his is that he added the "+" and whitespace portion before and after, which was needed. Thanks for your help!!
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