I've found some similar themes on stackoverflow, but I'm newbie to Python and Reg Exps.

I have a string

,"Completely renovated in 2009, the 2-star Superior Hotel Ibis BerlinMesse, with its 168 air-conditioned rooms, is located right next toBerlin's ICC and exhibition center. All rooms have Wi-Fi, and you cansurf the Internet free of charge at two iPoint-PCs in the lobby. Weprovide a 24-hour bar, snacks and reception service. Enjoy ourbreakfast buffet from 4am to 12pm on the 8th floor, where you have afantastic view across Berlin. You will find free car parking directlynext to the hotel.",

A pattern should be like: comma, double quote|any text with commas |double quote, comma. I need to replace commas in double quotes, for example with @ character. Which reg exp pattern should I use?

I tried this :

r',"([.*]*,[.*]*)*",' 

with different variations, but it doesn't work.

Thanks for the answers, the problem was solved.

If all you need to do is replace commas with the @ character you should look into doing a str_replace rather than regex.

str_a = "Completely renovated in 2009, the 2-star Superior Hotel Ibis Berlin Messe, with its 168 air-conditioned rooms, is located right next to Berlin's ICC and exhibition center. All rooms have Wi-Fi, and you can surf the Internet free of charge at two iPoint-PCs in the lobby. We provide a 24-hour bar, snacks and reception service. Enjoy our breakfast buffet from 4am to 12pm on the 8th floor, where you have a fantastic view across Berlin. You will find free car parking directly next to the hotel."str_a = str_a.replace('","', '@') #commas inside double quotes
str_a = str_a.replace(',', '@') #replace just commasprint str_a

Edit: Alternatively you could make a list of what you want to replace, then loop through it and perform the replacement. Ex:

to_replace = ['""', ',', '"']str_a = "Completely renovated in 2009, the 2-star Superior Hotel Ibis Berlin Messe, with its 168 air-conditioned rooms, is located right next to Berlin's ICC and exhibition center. All rooms have Wi-Fi, and you can surf the Internet free of charge at two iPoint-PCs in the lobby. We provide a 24-hour bar, snacks and reception service. Enjoy our breakfast buffet from 4am to 12pm on the 8th floor, where you have a fantastic view across Berlin. You will find free car parking directly next to the hotel."for a in to_replace:str_a = str_a.replace(a, '@')print str_a