Pattern-match & Replace - help required

[AT]

On Wednesday, 19 December 2012 18:16:18 UTC+5, Peter Otten  wrote:
> AT wrote:
> 
> 
> 
> > I am new to python and web2py framework. Need urgent help to match a
> 
> > pattern in an string and replace the matched text.
> 
> > 
> 
> > I've this string (basically an sql statement):
> 
> > stmnt = 'SELECT  taxpayer.id,
> 
> >          taxpayer.enc_name,
> 
> >          taxpayer.age,
> 
> >          taxpayer.occupation
> 
> >          FROM taxpayer WHERE (taxpayer.id IS NOT NULL);'
> 
> > 
> 
> > The requirement is to replace it with this one:
> 
> > r_stmnt = 'SELECT  taxpayer.id,
> 
> >            decrypt(taxpayer.enc_name),
> 
> >            taxpayer.age,
> 
> >            taxpayer.occupation
> 
> >            FROM taxpayer WHERE (taxpayer.id IS NOT NULL);'
> 
> > 
> 
> > Can somebody please help?
> 
> 
> 
> > The pattern is '%s.enc_%s', and after matching this pattern want to change
> 
> > it to 'decrypt(%s.enc_%s)'
> 
> 
> 
> after = re.compile(r"(\w+[.]enc_\w+)").sub(r"decrypt(\1)", before)

Thanks a million
Can you recommend a good online book/tutorial on regular expr. in python?

Regards