Assuming your string is s:
'$' in s # found
'$' not in s # not found
# original answer given, but less Pythonic than the above...
s.find('$')==-1 # not found
s.find('$')!=-1 # found
And so on for other characters.
... or
pattern = re.compile(r'[\d\$,]')
if pattern.findall(s):
print('Found')
else:
print('Not found')
... or
chars = set('0123456789$,')
if any((c in chars) for c in s):
print('Found')
else:
print('Not Found')
Top answer 1 of 9
355
Assuming your string is s:
'$' in s # found
'$' not in s # not found
# original answer given, but less Pythonic than the above...
s.find('$')==-1 # not found
s.find('$')!=-1 # found
And so on for other characters.
... or
pattern = re.compile(r'[\d\$,]')
if pattern.findall(s):
print('Found')
else:
print('Not found')
... or
chars = set('0123456789$,')
if any((c in chars) for c in s):
print('Found')
else:
print('Not Found')
2 of 9
35
user Jochen Ritzel said this in a comment to an answer to this question from user dappawit. It should work:
('1' in var) and ('2' in var) and ('3' in var) ...
'1', '2', etc. should be replaced with the characters you are looking for.
See this page in the Python 2.7 documentation for some information on strings, including about using the in operator for substring tests.
Update: This does the same job as my above suggestion with less repetition:
# When looking for single characters, this checks for any of the characters...
# ...since strings are collections of characters
any(i in '<string>' for i in '123')
# any(i in 'a' for i in '123') -> False
# any(i in 'b3' for i in '123') -> True
# And when looking for subsrings
any(i in '<string>' for i in ('11','22','33'))
# any(i in 'hello' for i in ('18','36','613')) -> False
# any(i in '613 mitzvahs' for i in ('18','36','613')) ->True
GeeksforGeeks
geeksforgeeks.org › python › python-check-if-string-contains-character
Check if string contains character - Python - GeeksforGeeks
July 23, 2025 - Explanation: The in operator is used to test membership, returning True if "e" is present in the string, and False otherwise. If found, it prints "Character found!", otherwise, it prints "Character not found!".
Issue when checking for special character in a string
When running through this checker loop and using the wild_card ‘*’ as the first character in the for loop below it returns false even when the word should be valid. Otherwise, the loop functions as intended. Does anyone have any ideas as to why this would be? More on discuss.python.org
9
0
April 19, 2022How to check if a string contains a character in a list
Use a loop , iterate through the list, check for existence of the character . More on reddit.com
7
2
February 19, 2022How can you check if a string contains any one character from a set of characters?
There's str.isdigit() checking if a string contains digits only: >>> '44 a b'.isdigit() False >>> Combined with any, applied to each character: >>> any([c.isdigit() for c in "44 a b"]) True >>> More on reddit.com
10
3
May 24, 2022Pandas - filter df rows where column contains str form another column
I'm not sure if this can be done directly with boolean indexing - and there may be a better approach but you could do it like so You could use apply() to generate a boolean for your test >>> df.apply(lambda row: row.FNAME in row.LNAME, axis=1) 0 False 1 True dtype: bool You could use that as a filter >>> df[ df.apply(lambda row: row.FNAME in row.LNAME, axis=1) ] ID FNAME LNAME 1 2 Fred Fredrickson [1 rows x 3 columns] Hopefully someone can let us know if there is a simpler approach More on reddit.com
4
2
January 17, 2017Videos
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Reddit
reddit.com › r/learnpython › how can you check if a string contains any one character from a set of characters?
r/learnpython on Reddit: How can you check if a string contains any one character from a set of characters?
May 24, 2022 -
Is there some easy, built-in way to check if a given string contains at least one single digit, 0-9? Everything I'm searching talks about the in operator or the find method, but those seem to require that you already know which digit you are looking for.
I'm leaning toward using an RE, but I wanted to know if there was a simpler way first.
Examples that would evaluate to true would be:
'44 a b' 'aa ba 5' '45 187'
and false would be any string without at least one digit.
I figure I can just try to match it with \d+, but I don't want to rely on REs too much, even though I find them fun!
Thanks!
Top answer 1 of 4
4
There's str.isdigit() checking if a string contains digits only: >>> '44 a b'.isdigit() False >>> Combined with any, applied to each character: >>> any([c.isdigit() for c in "44 a b"]) True >>>
2 of 4
3
Returns True if there is a digit and False if no digit: >>> not set('44 a a b').isdisjoint('1234567890') True >>> not set('testing').isdisjoint('1234567890') False >>> or >>> bool(set('3 a a b') & set('1234567890')) True >>> bool(set('testing') & set('1234567890')) False >>>
W3Schools
w3schools.com › python › gloss_python_check_string.asp
Python Check In String
Remove List Duplicates Reverse ... ... To check if a certain phrase or character is present in a string, we can use the keywords in or not in....
LearnDataSci
learndatasci.com › solutions › python-string-contains
Python String Contains – See if String Contains a Substring – LearnDataSci
Of the three options listed in ... a string contains a substring. Remember that the simplest solution is quite often the best one! Another option you've got for searching a string is using the find() method. If the argument we provide find() exists in a string, then the function will return the start location index of the substring we're looking for. If not, then the function will return -1. The image below shows how string characters are assigned ...
DigitalOcean
digitalocean.com › community › tutorials › python-check-if-string-contains-another-string
How To Check If a String Contains Another String in Python | DigitalOcean
April 9, 2026 - Without escaping, it would be ... the search matches the intended substring correctly. You can use the in operator, the find() method, or regular expressions to check if a string contains a substring in Python....
O'Reilly
oreilly.com › library › view › python-cookbook › 0596001673 › ch03s07.html
Checking Whether a String Contains a Set of Characters - Python Cookbook [Book]
July 19, 2002 - The solution generalizes to any sequence (not just a string), and any set (any object in which membership can be tested with the in operator, not just one of characters): def containsAny(str, set): """ Check whether sequence str contains ANY of the items in set.
Authors Alex MartelliDavid Ascher
Published 2002
Pages 608
Codecademy
codecademy.com › article › how-to-check-if-a-string-contains-a-substring-in-python
How to Check if a String Contains a Substring in Python | Codecademy
The performance is generally similar for small strings, but in is often preferred over .find() for readability and simplicity. ... 'The Codecademy Team, composed of experienced educators and tech experts, is dedicated to making tech skills accessible to all. We empower learners worldwide with expert-reviewed content that develops and enhances the technical skills needed to advance and succeed in their careers.'Meet the full team ... Learn how to remove characters from a Python string using `rstrip()`, `replace()`, and `re.sub()` with examples.
Real Python
realpython.com › python-string-contains-substring
How to Check if a Python String Contains a Substring – Real Python
December 1, 2024 - You may only want to match occurrences of your substring followed by punctuation, or identify words that contain the substring plus other letters, such as "secretly". For such cases that require more involved string matching, you can use regular expressions, or regex, with Python’s re module. For example, if you want to find all the words that start with "secret" but are then followed by at least one additional letter, then you can use the regex word character (\w) followed by the plus quantifier (+):
Stanford CS
cs.stanford.edu › people › nick › py › python-string.html
Python Strings
A Python string, like 'Hello' stores text as a sequence of individual characters.
GeeksforGeeks
geeksforgeeks.org › python › python-ways-to-check-string-contain-all-same-characters
Python | Ways to check string contain all same characters - GeeksforGeeks
March 14, 2023 - Auxiliary Space: O(1) as we are using only a variable to store the first character of the string and compare it with other characters. ... # Python code to demonstrate # to check whether string contains # all characters same or not # Initialising string list ini_list = ["aaaaaaaaaaa", "aaaaaaabaa"] # Printing initial string print("Initial Strings list", ini_list) # Using String comparison for i in ini_list: if i.count(i[0]) == len(i): print("String {} have all characters same".format(i)) else: print("String {} don't have all characters same".format(i))
Python.org
discuss.python.org › python help
Issue when checking for special character in a string - Python Help - Discussions on Python.org
April 19, 2022 - When running through this checker loop and using the wild_card ‘*’ as the first character in the for loop below it returns false even when the word should be valid. Otherwise, the loop functions as intended. Does anyone…
Wikipedia
en.wikipedia.org › wiki › Rabin–Karp_algorithm
Rabin–Karp algorithm - Wikipedia
November 9, 2025 - Naively computing the hash value ... each character is examined. Since the hash computation is done on each loop, the algorithm with a naive hash computation requires O(mn) time, the same complexity as a straightforward string matching algorithm. For speed, the hash must be computed in constant time. The trick is the variable hs already contains the previous ...
Pandas
pandas.pydata.org › docs › reference › api › pandas.read_csv.html
pandas.read_csv — pandas 3.0.4 documentation
By file-like object, we refer to objects with a read() method, such as a file handle (e.g. via builtin open function) or StringIO. ... Character or regex pattern to treat as the delimiter. If sep=None, the C engine cannot automatically detect the separator, but the Python parsing engine can, ...
NeetCode
neetcode.io › solutions › 217. contains duplicate
LeetCode 217 Contains Duplicate Solution & Explanation | NeetCode
public class Solution { public boolean hasDuplicate(int[] nums) { Set<Integer> seen = new HashSet<>(); for (int num : nums) { if (seen.contains(num)) { return true; } seen.add(num); } return false; } }
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › String › split
String.prototype.split() - JavaScript | MDN
If separator is a string, an Array of strings is returned, split at each point where the separator occurs in the given string. If separator is a regex, the returned Array also contains the captured groups for each separator match; see below for details.
Python
docs.python.org › 3 › library › enum.html
enum — Support for enumerations
StrEnum is the same as Enum, but its members are also strings and can be used in most of the same places that a string can be used.
Quora
quora.com › How-do-I-check-if-a-string-contains-a-character-in-Python
How to check if a string contains a character in Python - Quora
Quora is a place to gain and share knowledge. It's a platform to ask questions and connect with people who contribute unique insights and quality answers.
GeeksforGeeks
geeksforgeeks.org › python › python-check-if-string-contain-only-defined-characters-using-regex
Python - Check if String Contain Only Defined Characters Using Regex - GeeksforGeeks
November 19, 2025 - match() begins checking from the start, so we add ^ and $ to ensure the entire string must match the allowed characters. ... import re s = "Python_3" pattern = r"^[A-Za-z0-9_]+$" if re.match(pattern, s): print("Valid string") else: print("Invalid string")
Reddit
reddit.com › r/learnpython › how to check if a string contains a character in a list
r/learnpython on Reddit: How to check if a string contains a character in a list
February 19, 2022 -
I'm really new to python and i'm having some trouble figuring out how to check if a list contains a certain character.
For example:
list = ['a1', 'a2', 'b1', 'b2', 'a3', 'a5', 'c3']
how would I check to see what elements contain the string 'a'? sorry if i didn't word my question properly i'm still very new to coding, but any help would be appreciated.