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 - If you need to replace substrings based on regex patterns, use the sub() or subn() functions from the re module. re.sub() — Regular expression operations — Python 3.13.3 documentation
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How to regex replace and get the number of replacements with ...
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python regex dynamic replacements (intermediate) anthony explains ...
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#78 How to Search and Replace Strings in Python using Regex - YouTube
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Python re.sub() Tutorial: Text Substitution with Regular Expressions ...
Replace Text Like a Pro with Regex in Python - A Quick re.sub ...
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 # original string target_str = "Jessa knows testing and machine learning" # replace only first occurrence res_str = re.sub(r"\s", "-", target_str, count=1) # String after replacement print(res_str) # Output 'Jessa-knows testing and machine learning' # replace three occurrence res_str = re.sub(r"\s", "-", target_str, count=3) print(res_str) # Output 'Jessa-knows-testing-and machine learning'Code language: Python (python) Run · We saw how to find and replace the regex pattern with a fixed string in the earlier example.
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}'
GeeksforGeeks
geeksforgeeks.org › python › python-substituting-patterns-in-text-using-regex
Python - Substituting patterns in text using regex - GeeksforGeeks
July 12, 2025 - Syntax: re.sub(pattern, repl, string, ... 1: Substitution of a specific text pattern In this example, a given text pattern will be searched and substituted in a string....
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 method matches the regex pattern ... flags. In this first example, we will remove all the hyphens from a telephone number so that all the digits can occur together in the string....
Dive into Python
diveintopython.org › home › learn python programming › regex in python
RegEx in Python: Match and Replace Basics with Examples
May 3, 2024 - This powerful technique allows you to search for patterns within strings and replace them with desired text, making data manipulation smoother than ever. Whether you're working with data cleaning, processing, or even web scraping, understanding how to utilize Python string replace regex can significantly enhance your coding efficiency. Here's a concise guide with practical examples to get you started:
JanBask Training
janbasktraining.com › community › python-python › python-replace-regex
python .replace() regex | JanBask Training Community
May 7, 2025 - Allows pattern matching and replacement using regex. ... import re text = "Order123, Code456" new_text = re.sub(r'd+', '###', text) print(new_text) # Output: Order###, Code### ... Use .replace() for simple, direct substitutions.
Python documentation
docs.python.org › 3 › howto › regex.html
Regular expression HOWTO — Python 3.14.7 documentation
The optional argument count is the maximum number of pattern occurrences to be replaced; count must be a non-negative integer. The default value of 0 means to replace all occurrences. Here’s a simple example of using the sub() method.
Squash
squash.io › how-to-replace-regex-in-python
How To Replace Text with Regex In Python - Squash Labs
September 24, 2023 - In this example, the regex pattern [aeiou] matches any vowel in the input string. The occurrences of the vowels are replaced with asterisks using the re.sub() function. Related Article: How to Work with Encoding & Multiple Languages in Django · Another approach to replacing regex patterns in Python is by using regex groups and backreferences.
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 in the string concept, and it cannot be used for replacing the substring, or part of string were to replace() function is used to replace 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 function for replacing the given pattern in the actual string to obtain the modified string. This is mainly used for replacing special characters with spaces or some other characters to make the string readable. This is a guide to Python regex replace.
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Index.dev
index.dev › blog › regex-advanced-string-replacement-python
Python Regex Replace: How to Replace Strings Using re Module
In this example, the regex r"\d+" matches any sequence of digits. The square() function is called for each match, converting the matched number to an integer, squaring it, and returning the result as a string.
Codedamn
codedamn.com › news › python
Python replace regex for searching and replacing strings
July 1, 2023 - In this example, the re.sub() function is used to replace all occurrences of 'codedamn' with 'CODEDAMN'. The output would be: Hello, CODEDAMN coders! Welcome to CODEDAMN community! The real power of regex comes with its ability to use special characters to construct search patterns, making it a vital tool for string manipulations in Python...
PythonTest
pythontest.com › python › regex-search-replace
Python regex Search and Replace Examples | PythonTest
I also may want to make a backup of example.txt first. We can all of those things, as I’ll show below. I think the most basic form of a search/replace script in python is something like this: import fileinput import re for line in fileinput.input(): line = re.sub('foo','bar', line.rstrip()) print(line) The fileinput module takes care of the stream verses filename input handling. The re (regex...
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 second argument, the replace ... groups. In Python’s regex, the notation \<x> , where x is an integer between and including 1 to 99, signifies the nth matched group in the regex....
Python documentation
docs.python.org › 3 › library › re.html
re — Regular expression operations — Python 3.14.7 ...
However, Unicode strings and 8-bit strings cannot be mixed: that is, you cannot match a Unicode string with a bytes pattern or vice-versa; similarly, when asking for a substitution, the replacement string must be of the same type as both the pattern and the search string. Regular expressions use the backslash character ('\') to indicate special forms or to allow special characters to be used without invoking their special meaning. This collides with Python’s usage of the same character for the same purpose in string literals; for example, to match a literal backslash, one might have to write '\\\\' as the pattern string, because the regular expression must be \\, and each backslash must be expressed as \\ inside a regular Python string literal.
GeeksforGeeks
geeksforgeeks.org › python › python-regex-replace-captured-groups
Python Regex: Replace Captured Groups - GeeksforGeeks
July 23, 2025 - Regex is supported in almost all ... This article dives into one of the crucial aspects of regex in Python: Regex Groups, and demonstrates how to use `re.sub()` for group replacement with practical examples....
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
Top answer 1 of 7
882
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.
Wenleicao
wenleicao.github.io › Use_Regex_to_Partially_Replace_Text_in_Python
Use Regex to Partially Replace Text in Python
I use regex syntax to build a pattern. Use a search function to match the pattern. Looks we are successful match the target (Here I use .+ to represent anything between parentheses). I created two helper functions to remove prefix and appendix. Note here I use list comprehension to remove string since string is a list in python. Here I use the match string and rebuild the replacement string.