How to replace strings with Python Regular Expressions

Python regular expressions are often used to replace strings. Many people do not know how to solve this problem. The code below tells you that the problem is extremely simple and I hope you will gain some benefits.

1. Replace all matched substrings with newstring to replace all substrings in the subject that match the regular expression regex.

 
 

  
  
result, number = re.subn(regex, newstring, subject) 
 
 

2. replace all matched substrings with regular expression objects)

 
 

  
  
Rereobj = re. compile (regex)
  
  
Result, number = reobj. subn (newstring, subject) string split
 
 

Python string splitting

 
 

  
  
reresult = re.split(regex, subject) 
 
 

String sharding uses regular expression objects)

 
 

  
  
Rereobj = re. compile (regex)
  
  
Result = reobj. split (subject) Match
 
 

The following lists the matching usage of Python Regular Expressions:

1. test whether the regular expression matches all or part of the string regex = ur "..." # Regular Expression

 
 

  
  
if re.search(regex, subject):  
  
  
do_something() 
 
 

Else: do_anotherthing () 2. test whether the regular expression matches the entire string regex = ur "... \ Z" # End with \ Z at the end of the regular expression

 
 

  
  
if re.match(regex, subject):  
  
  
do_something()  
  
  
else:  
  
  
do_anotherthing() 
 
 

3. Create a matching object and obtain the matching details through this object. regex = ur "..." # Regular Expression

 
 

  
  
match = re.search(regex, subject)  
  
  
if match:  
  
  
# match start: match.start()  
  
  
# match end (exclusive): match.end()  
  
  
# matched text: match.group()  
  
  
do_something()  
  
  
else:  
  
  
do_anotherthing() 
 
 

The above is a detailed description of the Python Regular Expression in string replacement.