Finding a string in a list in Python
This tutorial shows you how to find elements from a Python list that have a specific substring in them.
We will use the following list and extract ackthe strings that have in it.
my_list = ["Jack", "Mack", "Jay", "Mark"]
forFind elements containing a specific substring from a list
using loop in Python
In this method, we iterate through the list and check if the substring exists in an element. If the substring exists in that element, then we store it in the string. The following code shows how to do it.
str_match = [s for s in my_list if "ack" in s]
print(str_match)
Output:
['Jack', 'Mack']
inThe keyword checks if the given string, in this case "ack", exists in the string. You can also use __contains__the method instead, which is a magic method of the string class. For example:
str_match = [s for s in my_list if s.__contains__("ack")]
print(str_match)
Output:
['Jack', 'Mack']
Use filter()the function to find elements containing a specific substring from a Python list
filter()The function retrieves a subset of data from a given object with the help of a function. The method will use lambdathe keyword to define the conditions for filtering the data. lambdaThe keyword creates a one-line function in Python lambda. Take a look at the following code snippet.
str_match = list(filter(lambda x: "ack" in x, my_list))
print(str_match)
Output:
['Jack', 'Mack']
Find elements containing a specific substring from a Python list using regular expressions
A regular expression is a sequence of characters that can be used as a matching pattern to search for elements. To use regular expressions, we have to import rethe module. In this method, we will use forthe loop and re.search()the method, which is used to return the elements that match a specific pattern. The following code will explain how to do it.
import re
pattern = re.compile(r"ack")
str_match = [x for x in my_list if re.search("ack", x)]
print(str_match)
Output:
['Jack', 'Mack']
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