Python:re.sub () Implements string substitution

Tag: regular represents style optional parameter Python lag tin Hello Sub

Features of the 1.re.sub

RE is an abbreviation for regular expression, which indicates regular expressions

A sub is an abbreviation for Substitude, which represents a replacement

Re.sub is a function of regular expressions that implements a more powerful substitution function than a normal string.

eg

Replace vs Re.sub

>>>stri="Hello 111 World 111"

>>>replacestr=stri. Replace ("111", "222") ===> "hello 222 world 222"

If

>>>stri="Hello 123 World 456"

>>>replacedstr = re.sub ("\d+", "222", inputstr) ===> put 123 and 456, switch to 222

Detailed explanations of the various parameters of the 2.re.sub

Re.sub a total of five parameters.

Re.sub (Pattern, Repl, String, count=0, flags=0) Three required parameters: pattern, REPL, string Two optional parameters: count, Flags

Python:re.sub () Implements string substitution