str.replace() v2|v3 does not recognize regular expressions.
To perform a substitution using a regular expression, use re.sub() v2|v3.
For example:
import re
line = re.sub(
r"(?i)^.*interfaceOpDataFile.*$",
"interfaceOpDataFile %s" % fileIn,
line
)
In a loop, it would be better to compile the regular expression first:
import re
regex = re.compile(r"^.*interfaceOpDataFile.*$", re.IGNORECASE)
for line in some_file:
line = regex.sub("interfaceOpDataFile %s" % fileIn, line)
# do something with the updated line
Top answer 1 of 4
750
str.replace() v2|v3 does not recognize regular expressions.
To perform a substitution using a regular expression, use re.sub() v2|v3.
For example:
import re
line = re.sub(
r"(?i)^.*interfaceOpDataFile.*$",
"interfaceOpDataFile %s" % fileIn,
line
)
In a loop, it would be better to compile the regular expression first:
import re
regex = re.compile(r"^.*interfaceOpDataFile.*$", re.IGNORECASE)
for line in some_file:
line = regex.sub("interfaceOpDataFile %s" % fileIn, line)
# do something with the updated line
2 of 4
529
You are looking for the re.sub function.
import re
s = "Example String"
replaced = re.sub('[ES]', 'a', s)
print(replaced)
will print axample atring
Note.nkmk.me
note.nkmk.me › home › python
Replace Strings in Python: replace(), translate(), and Regex | note.nkmk.me
May 4, 2025 - Use the | operator to match multiple patterns. Each pattern may include special regex characters or literal substrings. This allows you to replace different substrings with the same string.
python - How to input a regex in string.replace? - Stack Overflow
I need some help on declaring a regex. My inputs are like the following: this is a paragraph with in between and then there are cases ... where the number ranges fro... More on stackoverflow.com
How to replace string using regular expression in Python - Stack Overflow
I need help with replacing characters in a string using regular expressions. ... If you're only working with dates I think you're better off using a datetime: stackoverflow.com/questions/2265357/… ... If you want to use regex, you need to import it via import re and use it instead of ... More on stackoverflow.com
python .replace() regex - Stack Overflow
For anything in production, I would ... either regex or simple string search can accomplish. 2018-03-03T18:42:42.197Z+00:00 ... Save this answer. ... Show activity on this post. For this particular case, if using re module is overkill, how about using split (or rsplit) method as ... Copy#!/usr/bin/python ... More on stackoverflow.com
String replace method in dart with regex
str.replace(Regex(r"pattern"),"") More on reddit.com
9
3
September 1, 202203:48
Python re.sub() Tutorial: Text Substitution with Regular Expressions ...
03:06
Replace a String With .replace() (Video) – Real Python
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python regex dynamic replacements (intermediate) anthony explains ...
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Flexiple
flexiple.com › python › python-regex-replace
Python regex: How to search and replace strings | Flexiple - Flexiple
To replace a string in Python, the regex sub() method is used. It is a built-in Python method in the re module that returns a replaced string. Don't forget to import the re module.
PYnative
pynative.com › home › python › regex › python regex replace pattern in a string using re.sub()
Python Regex Replace Pattern in a string using re.sub()
July 19, 2021 - import re # replacement function to convert uppercase letter to lowercase def convert_to_lower(match_obj): if match_obj.group() is not None: return match_obj.group().lower() # Original String str = "Emma LOves PINEAPPLE DEssert and COCONUT Ice Cream" # pass replacement function to re.sub() res_str = re.sub(r"[A-Z]", convert_to_lower, str) # String after replacement print(res_str) # Output 'Emma loves pineapple dessert and coconut Ice Cream'Code language: Python (python) Run · We saw how to find and replace the single regex pattern in the earlier examples.
Top answer 1 of 7
881
This tested snippet should do it:
import re
line = re.sub(r"</?\[\d+>", "", line)
Edit: Here's a commented version explaining how it works:
line = re.sub(r"""
(?x) # Use free-spacing mode.
< # Match a literal '<'
/? # Optionally match a '/'
\[ # Match a literal '['
\d+ # Match one or more digits
> # Match a literal '>'
""", "", line)
Regexes are fun! But I would strongly recommend spending an hour or two studying the basics. For starters, you need to learn which characters are special: "metacharacters" which need to be escaped (i.e. with a backslash placed in front - and the rules are different inside and outside character classes.) There is an excellent online tutorial at: www.regular-expressions.info. The time you spend there will pay for itself many times over. Happy regexing!
2 of 7
66
str.replace() does fixed replacements. Use re.sub() instead.
Pandas
pandas.pydata.org › docs › reference › api › pandas.Series.str.replace.html
pandas.Series.str.replace — pandas 3.0.5 documentation
Method to replace occurrences of a substring with another substring. ... Extract substrings using a regular expression. ... Find all occurrences of a pattern or regex in each string.
Index.dev
index.dev › blog › regex-advanced-string-replacement-python
Python Regex Replace: How to Replace Strings Using re Module
The re.sub() function is the primary tool for performing string replacements with regex in Python. It allows you to specify a regex pattern to search for, a replacement string, and the target string where the replacement will occur.
Real Python
realpython.com › replace-string-python
How to Replace a String in Python – Real Python
January 15, 2025 - In this tutorial, you'll learn how to remove or replace a string or substring. You'll go from the basic string method .replace() all the way up to a multi-layer regex pattern using the sub() function from Python's re module.
GeeksforGeeks
geeksforgeeks.org › python › python-substituting-patterns-in-text-using-regex
Python - Substituting patterns in text using regex - GeeksforGeeks
July 12, 2025 - # Python implementation of substituting a # specific text pattern in a string using regex # importing regex module import re # Function to perform # operations on the strings def substitutor(): # a string variable sentence1 = "It is raining outside." # replacing text 'raining' in the string # variable sentence1 with 'sunny' thus # passing first parameter as raining # second as sunny, third as the # variable name in which string is stored # and printing the modified string print(re.sub(r"raining", "sunny", sentence1)) # a string variable sentence2 = "Thank you very very much."
Leapcell
leapcell.io › blog › how-to-use-python-regex-for-string-replacement
How to Use Python Regex for String Replacement | Leapcell
July 25, 2025 - To use regex in Python, first import the built-in re module: ... The main function used for regex replacement is re.sub(pattern, repl, string).
Python documentation
docs.python.org › 3 › library › re.html
re — Regular expression operations — Python 3.14.6 ...
May 25, 2026 - Source code: Lib/re/ This module provides regular expression matching operations similar to those found in Perl. Both patterns and strings to be searched can be Unicode strings ( str) as well as 8-...
EDUCBA
educba.com › home › software development › software development tutorials › python string tutorial › python regex replace
Python regex replace | Learn the Parameters of Python regex replace
May 13, 2024 - In Python, we use replace() function ... the entire string; hence to do this, we use regular expression which provides “re” module and to replace part of the string we use sub() function as we saw how simple it is to use this ...
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Plain English
python.plainenglish.io › the-incredible-power-of-pythons-replace-regex-6cc217643f37
The incredible power of Python’s replace regex | by Josh Weinstein | Python in Plain English
November 1, 2020 - The replacement string can be a literal replacement, such as matching [0-9]+ and replacing it with "abc" . Such an operation would convert all digit sequences in a string with the character sequence "abc" .
Medium
medium.com › @wepypixel › complete-python-regex-replace-guide-using-re-sub-pypixel-9b30b2604d7a
Complete Python Regex Replace Guide using re.sub() | PyPixel | by Stilest | Medium
December 8, 2023 - The re.sub() method in Python provides powerful search and replace functionality using regular expressions. The regex replace works by specifying the string to modify, defining a regex pattern to match against, and providing a replacement substring.
YouTube
youtube.com › datadaft
Python Regex: How To Replace All Substrings In a String - YouTube
↓ Code Available Below! ↓ This video shows how to replace all substrings that match a given pattern with a different string using the regular expressions p...
Published October 2, 2020 Views 7K
Codedamn
codedamn.com › news › python
Python replace regex for searching and replacing strings
July 1, 2023 - This can be done using the following line of code: ... One common use of regex is to find and replace certain parts of a string. This is accomplished using the re.sub() function in Python's re module.
Top answer 1 of 2
5
This works.
import re
s3 = ['March/21/2019' , 'Mar/23/2019']
s3 = [re.sub(r'Mar[a-z]*', '03', item) for item in s3]
# ['03/21/2019', '03/23/2019']
Of course, you can also use a for loop for better readability.
import re
s3 = ['March/21/2019' , 'Mar/23/2019']
for i in range(len(s3)):
s3[i] = re.sub(r'Mar[a-z]*', '03', s3[i])
# ['03/21/2019', '03/23/2019']
2 of 2
1
If you're only working with dates, try something like this:
import datetime
s3 = ['March/21/2019' , 'Mar/23/2019']
for i in range(0, len(s3)):
try:
newformat = datetime.datetime.strptime(s3[i], '%B/%d/%Y')
except ValueError:
newformat = datetime.datetime.strptime(s3[i], '%b/%d/%Y')
s3[i] = newformat.strftime('%m/%d/%Y')
s3 now contains ['03/21/2019', '03/23/2019']
Dive into Python
diveintopython.org › home › learn python programming › regex in python
RegEx in Python: Match and Replace Basics with Examples
May 3, 2024 - It's particularly useful when you want to modify strings in a sophisticated manner, including using Python regex sub capture groups to manipulate specific parts of the matched text. import re text = "2024 is the year of code" # Replace all instances of a digit sequence with 'XXXX' result = re.sub(r'\d+', 'XXXX', text) print(result) # Output: XXXX is the year of code
Top answer 1 of 4
888
No. Regular expressions in Python are handled by the re module.
article = re.sub(r'(?is)</html>.+', '</html>', article)
In general:
str_output = re.sub(regex_search_term, regex_replacement, str_input)
2 of 4
119
In order to replace text using regular expression use the re.sub function:
sub(pattern, repl, string[, count, flags])
It will replace non-everlaping instances of pattern by the text passed as string. If you need to analyze the match to extract information about specific group captures, for instance, you can pass a function to the string argument. more info here.
Examples
>>> import re
>>> re.sub(r'a', 'b', 'banana')
'bbnbnb'
>>> re.sub(r'/\d+', '/{id}', '/andre/23/abobora/43435')
'/andre/{id}/abobora/{id}'
YouTube
youtube.com › automate with rakesh
#78 How to Search and Replace Strings in Python using Regex - YouTube
Learn how to use the regex in python to search and replace strings.Important Links:🔥 Visit Channel : https://www.youtube.com/c/AutomatewithRakesh🔥 To Su...
Published July 16, 2022 Views 3K