Python regular Expressions (ii)

The sub () and Subn () sub (pattern,repl,string,count=0) are used to implement the search and replace function, where the pattern of all regular expressions is replaced with REPL, and all occurrences are replaced unless count is defined. The part used to replace is usually a string, or it may be a function that returns a string. The sub () also returns the total number of replacements that occurred, and returns the and replaced strings as two element tuples.

m = Re.sub ('T','T',' this and that')Print1, MM= Re.subn ('[AE]','X','abcdef')Print2, MD= Re.sub (r'(\d{1,2})/(\d{1,2})/(\d{2}|\d{4})'R'\2/\1/\3','November/21st/1995')Print3, D1 This and that2 ('xbcdxf', 2)3 November/21st/1995

Split () Split string:

Re.split (':','str1:str2:str3') ['  str1"str2"str3"

Python regular Expressions (ii)