On 2015-07-12 10:40, Yonggang Chen wrote:
There are two named groups in my pattern: myFlag and id, I want to add one more
myFlag immediately before group id.
Here is my current code:
## code begin
# i'm using Python 3.4.2
import re
import os
contents = b'''
xdlg::xdlg(x_app* pApp, CWnd* pParent)
: customized_dlg((UINT)0, pParent, pApp)
, m_pReaderApp(pApp)
, m_info(pApp)
{
}
'''
pattern = rb'(?P<myFlag>[a-zA-Z0-9_]+)::(?P=myFlag).+:.+(?P<id>\(UINT\)0 *,)'
res = re.search(pattern, contents, re.DOTALL)
if None != res:
print(res.groups()) # the output is (b'xdlg', b'(UINT)0,')
# 'replPattern' becomes
b'(?P<myFlag>[a-zA-Z0-9_]+)::(?P=myFlag).+:.+((?P=myFlag)\\(UINT\\)0 *,)'
In a replacement template, the (?P...) parts are just literals.
replPattern = pattern.replace(b'?P<id>', b'(?P=myFlag)', re.DOTALL)
This .replace method is a string method. It has nothing to do with
regex.
print(replPattern)
contents = re.sub(pattern, replPattern, contents)
You're not passing in the DOTALL flag; this function doesn't have an
argument for the flags, anyway.
You could compile the regex and then use its .sub method, or use inline
flags instead.
print(contents)
# code end
The expected results should be:
xdlg::xdlg(x_app* pApp, CWnd* pParent)
: customized_dlg(xdlg(UINT)0, pParent, pApp)
, m_pReaderApp(pApp)
, m_info(pApp)
{
}
but now the result this the same with the original:
xdlg::xdlg(x_app* pApp, CWnd* pParent)
: customized_dlg((UINT)0, pParent, pApp)
, m_pReaderApp(pApp)
, m_info(pApp)
{
}
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