On 11/11/14 4:18 AM, satishmlm...@gmail.com wrote:
What does \1 do in the following piece of code(fourth line)? import re print(re.sub('[ABC]', '*', 'XAXAXBXBXCXC')) print(re.sub('[ABC]_', '*', 'XA-XA_XB-XB_XC-XC_')) print(re.sub('(.) spam', 'spam\\1', 'x spam, y spam')) def mapper(matchobj): return 'spam' + matchobj.group(1) print(re.sub('(.) spam', mapper, 'x spam, y spam'))
Maybe you can't tell from the reception you're getting here: People are growing tired of your questions about basic Python behavior. They want you to find a way to learn for yourself. You're asking about regular expressions. The Python docs have an extensive page detailing how they work: https://docs.python.org/3/library/re.html
You need to learn how to find this stuff out for yourself. Ben Finney even gave you a pointer to a helpful site for experimenting with regexes: http://pythex.org/
-- Ned Batchelder, http://nedbatchelder.com -- https://mail.python.org/mailman/listinfo/python-list
