Python program to Extract Mesh matching Strings
Last Updated :
01 May, 2023
Given a character mesh, containing missing characters, match the string which matches the mesh.
Example:
Input : test_list = [“geeks”, “best”, “peeks”], mesh = “_ee_s”
Output : [‘geeks’, ‘peeks’]
Explanation : Elements according to mesh are geeks and peeks.
Input : test_list = [“geeks”, “best”, “test”], mesh = “_e_t”
Output : [‘best’, ‘test’]
Explanation : Elements according to mesh are best and test.
Method #1: Using loop + all() + len() + zip()
The combination of the above can be used to solve this problem. In this, we perform the task of matching mesh and each string using zip() and all() is used to check for all strings, len() is used to test for correct string length matching mesh.
Python3
test_list = [ "geeks" , "best" , "peeks" , "for" , "seeks" ]
print ( "The original list : " + str (test_list))
mesh = "_ee_s"
res = []
for sub in test_list:
if ( len (sub) = = len (mesh)) and all ((ele1 = = "_" ) or (ele1 = = ele2)
for ele1, ele2 in zip (mesh, sub)):
res.append(sub)
print ( "The extracted strings : " + str (res))
|
Output
The original list : ['geeks', 'best', 'peeks', 'for', 'seeks']
The extracted strings : ['geeks', 'peeks', 'seeks']
Time Complexity: O(n)
Auxiliary Space: O(n)
Method #2: Using list comprehension
This solves the problem in a similar way as the above method, the only difference here is that 1 liner solution is provided.
Python3
test_list = [ "geeks" , "best" , "peeks" , "for" , "seeks" ]
print ( "The original list : " + str (test_list))
mesh = "_ee_s"
res = [sub for sub in test_list if ( len (sub) = = len (mesh)) and all ((ele1 = = "_" ) or (ele1 = = ele2)
for ele1, ele2 in zip (mesh, sub))]
print ( "The extracted strings : " + str (res))
|
Output
The original list : ['geeks', 'best', 'peeks', 'for', 'seeks']
The extracted strings : ['geeks', 'peeks', 'seeks']
Time Complexity: O(n)
Auxiliary Space: O(n)
Method 3: Using the filter() function along with lambda function
- Start by initializing the list of strings test_list and the mesh string mesh.
- Create an empty list result to store the strings that match the mesh.
- Loop through each string s in test_list.
- Check if the length of s is equal to the length of mesh. If not, move on to the next string.
- Loop through each character c in s and its corresponding character m in mesh.
- If m is equal to “_”, move on to the next character. Otherwise, check if c is equal to m. If not, move on to the next string.
- If the loop completes without finding any mismatches, append the string s to the result list.
- Once all strings have been checked, return the result list containing the matching strings.
Python3
test_list = [ "geeks" , "best" , "peeks" , "for" , "seeks" ]
print ( "The original list : " + str (test_list))
mesh = "_ee_s"
res = list ( filter ( lambda x: len (x) = = len (mesh) and all ((ele1 = = "_" ) or (ele1 = = ele2) for ele1, ele2 in zip (mesh, x)), test_list))
print ( "The extracted strings : " + str (res))
|
Output
The original list : ['geeks', 'best', 'peeks', 'for', 'seeks']
The extracted strings : ['geeks', 'peeks', 'seeks']
Time Complexity: O(n*m), where n is the number of strings in the input list, and m is the length of the mesh.
Auxiliary Space: O(k), where k is the number of strings that match the mesh.
Method #4: Using a for loop and a helper function
Python3
def match_mesh(mesh, string):
if len (mesh) ! = len (string):
return False
for i in range ( len (mesh)):
if mesh[i] ! = '_' and mesh[i] ! = string[i]:
return False
return True
test_list = [ "geeks" , "best" , "peeks" , "for" , "seeks" ]
print ( "The original list : " + str (test_list))
mesh = "_ee_s"
res = []
for string in test_list:
if match_mesh(mesh, string):
res.append(string)
print ( "The extracted strings : " + str (res))
|
Output
The original list : ['geeks', 'best', 'peeks', 'for', 'seeks']
The extracted strings : ['geeks', 'peeks', 'seeks']
Time complexity: O(n * m), where n is the number of strings in the list and m is the length of the mesh.
Auxiliary space: O(k), where k is the number of strings that match the mesh.
Like Article
Suggest improvement
Share your thoughts in the comments
Please Login to comment...