print [s for s in list if sub in s]
If you want them separated by newlines:
print "\n".join(s for s in list if sub in s)
Full example, with case insensitivity:
mylist = ['abc123', 'def456', 'ghi789', 'ABC987', 'aBc654']
sub = 'abc'
print "\n".join(s for s in mylist if sub.lower() in s.lower())
Top answer 1 of 5
200
print [s for s in list if sub in s]
If you want them separated by newlines:
print "\n".join(s for s in list if sub in s)
Full example, with case insensitivity:
mylist = ['abc123', 'def456', 'ghi789', 'ABC987', 'aBc654']
sub = 'abc'
print "\n".join(s for s in mylist if sub.lower() in s.lower())
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All the answers work but they always traverse the whole list. If I understand your question, you only need the first match. So you don't have to consider the rest of the list if you found your first match:
mylist = ['abc123', 'def456', 'ghi789']
sub = 'abc'
next((s for s in mylist if sub in s), None) # returns 'abc123'
If the match is at the end of the list or for very small lists, it doesn't make a difference, but consider this example:
import timeit
mylist = ['abc123'] + ['xyz123']*1000
sub = 'abc'
timeit.timeit('[s for s in mylist if sub in s]', setup='from __main__ import mylist, sub', number=100000)
# for me 7.949463844299316 with Python 2.7, 8.568840944994008 with Python 3.4
timeit.timeit('next((s for s in mylist if sub in s), None)', setup='from __main__ import mylist, sub', number=100000)
# for me 0.12696599960327148 with Python 2.7, 0.09955992100003641 with Python 3.4
GeeksforGeeks
geeksforgeeks.org › python › python-finding-strings-with-given-substring-in-list
Finding Strings with Given Substring in List - Python - GeeksforGeeks
July 11, 2025 - Explanation :re.findall() checks for occurrences of the substring b in each string of a. If a match is found, the string is included in the list res.
How to check if any element in a list contains a substring
If you don't need to know exactly which element(s) contain the substring, then you could use the any built-in function in combination with a list comprehension l = ["Hey dude", "Hey bro", "Sup dude", "Hey bud"] substring = "Sup" if any([substring in element for element in l]): print(f"One or more elements of {l} contain the substring {substring}") else: print(f"No elements of {l} contain the substring {substring}") Here's an explanation about the any function. Alternatively, switch out any for all if you want to check if all the elements of the list contain the substring. all documentation More on reddit.com
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October 28, 2019Python: How to check a string for substrings from a list? - Stack Overflow
How can I check a string for substrings contained in a list, like in Check if a string contains an element from a list (of strings), but in Python? More on stackoverflow.com
How do I check if string contains all substrings in list?
You could try
if all([val in string for val in list]):
Which checks the truth of each check and returns True only if all are True. Otherwise you're looking at a loop (or if your lists get really big a generator).
11
1
November 16, 2018is string.find(substring) time complexity of O(n) or (O*m)?
It doesn't seem to be specified anywhere but I would expect it to be O(n×m) where n is the length of string and m is the length of substring. More on reddit.com
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May 14, 2019 Top answer 1 of 16
3835
>>> x = "Hello World!"
>>> x[2:]
'llo World!'
>>> x[:2]
'He'
>>> x[:-2]
'Hello Worl'
>>> x[-2:]
'd!'
>>> x[2:-2]
'llo Worl'
Python calls this concept "slicing" and it works on more than just strings. Take a look here for a comprehensive introduction.
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Just for completeness as nobody else has mentioned it. The third parameter to an array slice is a step. So reversing a string is as simple as:
some_string[::-1]
Or selecting alternate characters would be:
"H-e-l-l-o- -W-o-r-l-d"[::2] # outputs "Hello World"
The ability to step forwards and backwards through the string maintains consistency with being able to array slice from the start or end.
IONOS
ionos.com › digital guide › websites › web development › python substring
How to create and edit Python substrings - IONOS
July 19, 2023 - Due to the blank space between the words, each word is now a substring. The substrings are stored in the “result” variable: [‘Python’, ‘is’, ‘a’, ‘popular’, ‘language.’]. You can also save Python substrings in a list if you use a regular expression on a string and then the findall function from the “re” library.
CodeSignal
codesignal.com › learn › courses › practicing-string-operations-and-type-conversions-in-python › lessons › exploring-substring-search-in-python-strings
Exploring Substring Search in Python Strings
We're to identify all occurrences of each substring within its corresponding original string and return a list of the starting indices of these occurrences.
GeeksforGeeks
geeksforgeeks.org › python › python-get-all-substrings-of-given-string
Python - Get all substrings of given string - GeeksforGeeks
July 12, 2025 - Store substrings in a list: Each generated substring is appended to the substrings list for collection. itertools.combinations() function generates all possible combinations of a given length from an iterable. It is useful for generating substrings of a specific length by specifying the range of indices for each combination. ... import itertools # Define the input string s = "abc" # Get all substrings using combinations of indices substrings = [''.join(s[i:j]) for i, j in itertools.combinations(range(len(s) + 1), 2)] print(substrings)
GeeksforGeeks
geeksforgeeks.org › python › create-list-of-substrings-from-list-of-strings-in-python
Create List of Substrings from List of Strings in Python - GeeksforGeeks
July 23, 2025 - In this example, a list comprehension is employed to create a new list, `substring_list`, containing substrings extracted from each string in the `original_list`. The slicing notation `[s[1:4] for s in original_list]` extracts characters from index 1 to 3 (exclusive) from each string in the original list.
GeeksforGeeks
geeksforgeeks.org › python › how-to-substring-a-string-in-python
How to Substring a String in Python - GeeksforGeeks
July 23, 2025 - We can use the split() function to get the substrings.The split() method effectively splits the string "Geeks For Geeks" into words based on spaces. So, the resulting substrings list contains each word as an element
DigitalOcean
digitalocean.com › community › tutorials › python-string-substring
Python String Substring | DigitalOcean
August 4, 2022 - s = 'My Name is Pankaj' # create substring using slice name = s[11:] print(name) # list of substrings using split l1 = s.split() print(l1) ... We can use in operator or find() function to check if substring is present in the string or not.
GeeksforGeeks
geeksforgeeks.org › python › extract-list-of-substrings-in-list-of-strings-in-python
Extract List of Substrings in List of Strings in Python - GeeksforGeeks
July 23, 2025 - List comprehension is a concise and powerful way to create lists in Python. It can be employed to extract substrings based on certain conditions or patterns. The following example demonstrates how to extract all substrings containing a specific keyword: ... string_list = ["apple", "banana", "cherry", "date"] keyword = "an" result = [substring for substring in string_list if keyword in substring] print(result)
Reddit
reddit.com › r/learnpython › how to check if any element in a list contains a substring
r/learnpython on Reddit: How to check if any element in a list contains a substring
October 28, 2019 -
Say I have a list of strings like: ["Hey dude", "Hey bro", "Sup dude", "Hey bud"]
How do I check if *any* of those strings in the list contain the word "Sup"?Alternatively, in my case, I could also check if *all* of the strings contain "Hey" , which I also don't know how to do.
(Sorry, I'm new to Python)
Edit: Thank you so much for all the help, guys <3
Top answer 1 of 5
7
If you don't need to know exactly which element(s) contain the substring, then you could use the any built-in function in combination with a list comprehension l = ["Hey dude", "Hey bro", "Sup dude", "Hey bud"] substring = "Sup" if any([substring in element for element in l]): print(f"One or more elements of {l} contain the substring {substring}") else: print(f"No elements of {l} contain the substring {substring}") Here's an explanation about the any function. Alternatively, switch out any for all if you want to check if all the elements of the list contain the substring. all documentation
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Sure. Here's how I might approach it. There may be shorter / clearer ways also. # define a var containing the universe of phrases list_of_phrases = ["Hey dude", "Hey bro", "Sup dude", "Hey bud"] # define var to be populated by phrases that match criteria later interesting_phrases = [] # process the list of phrases for phrase in list_of_phrases: if "dude" in phrase: # we're interested in phrases with the word "dude" in them interesting_phrases += [phrase] # this one is interesting, so add it to the list # check out the results print(interesting_phrases)
Sentry
sentry.io › sentry answers › python › extract a substring from a string in python
Extract a substring from a string in Python
2 weeks ago - Extract substrings from Python strings using slice notation with [start:end] indexes, or use re.search() with regex patterns for matching specific formats
YouTube
youtube.com › watch
How to get All Substrings of a String in Python With List Comprehensions! List Comprehension How To - YouTube
If you liked the content, please consider checking out my Patreon! - https://www.patreon.com/CodingUnderPressure/membership Hey everyone, today we are going ...
Published October 9, 2021
Edureka
edureka.co › blog › substring-in-python
Everything You Need to Know about Substring in Python | Edureka
November 28, 2024 - # Slicing or substring a string using positive index. s= 'PYTHON' s[0:3] Output: ‘PYT’ · Retrieving all substrings using list comprehension
AskPython
askpython.com › home › python string substring
Python String Substring - AskPython
August 6, 2022 - str = 'Engineering Discipline' sub1 = str[:3] sub2 = str[6:] print ("Resultant substring from the start: ", sub1) print ("Resultant substring from the end: ", sub2) ... from itertools import combinations str1 = "Safa" print("The original string ...
Reddit
reddit.com › r/learnpython › how do i check if string contains all substrings in list?
r/learnpython on Reddit: How do I check if string contains all substrings in list?
November 16, 2018 -
I have a list, that takes inputs from the user, this means it can change size; for example: list = ["test", "do"] or list = ["a", "b", "c"]
I want to check if variable string, contains all the substrings in list.
I thought if I used:
if list in string: that would work, but it didn't, TypeError: 'in <string>' requires string as left operand, not list
Is there another function/method for this? Or am I going to have to loop len(list) times (I really don't want to do that, because I check hundreds of changing strings)?
Top answer 1 of 4
5
You could try
if all([val in string for val in list]):
Which checks the truth of each check and returns True only if all are True. Otherwise you're looking at a loop (or if your lists get really big a generator).
2 of 4
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I don't really understand your question, but the easiest to understand solution is probably
if len(set(sub) - set(super)) > 0:Another one, straightforward, but more complex, is
if all(el in sub for el in super):Pluralsight
pluralsight.com › blog › software development
6 Best Methods for Python String to List Conversion | Pluralsight
String slicing is a popular method to extract substrings from a string. Combining it with list comprehension can convert a string to a list.
GeeksforGeeks
geeksforgeeks.org › python › python-all-occurrences-of-substring-in-string
Python - All occurrences of substring in string - GeeksforGeeks
July 12, 2025 - List comprehension with range() can be used to generate all starting positions of a substring by iterating over the string indices.
PhoenixNAP
phoenixnap.com › home › kb › devops and development › how to substring a string in python
How to Substring a String in Python | phoenixNAP KB
November 27, 2025 - The resulting indexes are in a list. If there are no matches, the code returns an empty list. ... You've learned how to create and work with substrings in Python. String slicing and various built-in methods simplify working with substrings.