Python Regular Expressions: how to replace strings for instances and python Regular Expressions

Python Regular Expressions: how to replace strings for instances and 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 (use regular expression objects)

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

Python string splitting

reresult = re.split(regex, subject) 

String splitting (using regular expression objects)

rereobj = re.compile(regex) result = reobj.split(subject) 

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" # The regular expression ends with \ Z at the end.

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. I hope it will be helpful for everyone's learning, and I hope you can support the house of helping customers more.