Given a list of strings and a list of substring. The task is to extract all the occurrences of substring from the list of strings.
Examples:
Input : test_list = [“gfg is best”, “gfg is good for CS”, “gfg is recommended for CS”]
subs_list = [“gfg”, “CS”]
Output : [‘gfg is good for CS’, ‘gfg is recommended for CS’]
Explanation : Result strings have both “gfg” and “CS”.
Input : test_list = [“gfg is best”, “gfg is recommended for CS”]
subs_list = [“gfg”]
Output : [“gfg is best”, “gfg is recommended for CS”]
Explanation : Result strings have “gfg”.
Method #1 : Using loop + in operator
The combination of the above functions can be used to solve this problem. In this, we run a loop to extract all strings and also all substring in the list. The in operator is used to check for substring existence.
Python3
# Python3 code to demonstrate working of # Strings with all Substring Matches # Using loop + in operator # initializing list test_list = ["gfg is best", "gfg is good for CS", "gfg is recommended for CS"] # printing original list print("The original list is : " + str(test_list)) # initializing Substring List subs_list = ["gfg", "CS"] res = [] for sub in test_list: flag = 0 for ele in subs_list: # checking for non existance of # any string if ele not in sub: flag = 1 break if flag == 0: res.append(sub) # printing result print("The extracted values : " + str(res)) |
Output:
The original list is : [‘gfg is best’, ‘gfg is good for CS’, ‘gfg is recommended for CS’]
The extracted values : [‘gfg is good for CS’, ‘gfg is recommended for CS’]
Method #2 : Using all() + list comprehension
This is a one-liner approach with the help of which we can perform this task. In this, we check for all values existence using all(), and list comprehension is used to iteration of all the containers.
Python3
# Python3 code to demonstrate working of # Strings with all Substring Matches # Using all() + list comprehension # initializing list test_list = ["gfg is best", "gfg is good for CS", "gfg is recommended for CS"] # printing original list print("The original list is : " + str(test_list)) # initializing Substring List subs_list = ["gfg", "CS"] # using all() to check for all values res = [sub for sub in test_list if all((ele in sub) for ele in subs_list)] # printing result print("The extracted values : " + str(res)) |
Output:
The original list is : [‘gfg is best’, ‘gfg is good for CS’, ‘gfg is recommended for CS’]
The extracted values : [‘gfg is good for CS’, ‘gfg is recommended for CS’]
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