10 matching methods for Python Regular Expressions

Python Regular Expressions require a variety of matching methods, but we cannot blindly match them. Next we will introduce ten matching methods for Python regular expressions that we often encounter. I hope you will gain some benefits.

1. test whether the Python 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 Python Regular Expression matches the entire string.

 
 

  
  
Regex = ur "... \ Z" # The regular expression ends with \ Z.
  
  
If re. match (regex, subject ):
  
  
Do_something ()
  
  
Else:
  
  
Do_anotherthing ()
 
 

3. Create a matching object and obtain matching details through the 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 ()
 
 

4. Obtain the substring matched by the Python Regular Expression

 
 

  
  
Regex = ur "..." # Regular Expression
  
  
Match = re. search (regex, subject)
  
  
If match:
  
  
Result = match. group ()
  
  
Else:
  
  
Result = ""
 
 

5. Obtain the substring matching the capture group.

 
 

  
  
Regex = ur "..." # Regular Expression
  
  
Match = re. search (regex, subject)
  
  
If match:
  
  
Result = match. group (1)
  
  
Else:
  
  
Result = ""
 
 

6. Obtain the substring matched by the famous group

 
 

  
  
Regex = ur "..." # Regular Expression
  
  
Match = re. search (regex, subject)
  
  
If match:
  
  
Result = match. group ("groupname ")
  
  
Else:
  
  
Result = ""
 
 

7. Put all matched substrings in the string into the array.

 
 

  
  
reresult = re.findall(regex, subject) 
 
 

8. traverse all matched substrings

 
 

  
  
(Iterate over all matches in a string)  
  
  
for match in re.finditer(r"<(.*?)\s*.*?/\1>", subject)  
  
  
# match start: match.start()  
  
  
# match end (exclusive): match.end()  
  
  
# matched text: match.group() 
 
 

9. Create a regular expression object using a Python Regular Expression string

 
 

  
  
(Create an object to use the same regex for many 
operations)  
  
  
rereobj = re.compile(regex) 
 
 

10. Python Regular Expression object version in use 1

 
 

  
  
rereobj = re.compile(regex)  
  
  
if reobj.search(subject):  
  
  
do_something()  
  
  
else:  
  
  
do_anotherthing() 
 
 

The above is a solution for matching problems related to Python regular expressions.