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Python | Check if a given string can be formed by concatenating string list items

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Examples :

  Input:  str = ’python’ lst = [’ co’, ’de’,’ py’, ’ks ’,’ on’]  Output:  False  Input:  str = ’geeks’ lst = [’ for’, ’ge’,’ abc’, ’ks’,’ e’, ’xyz’]  Output:  True 

Approach # 1: Using itertools.permuations

We can use all permutations from the given list and then join with them. If any join result is the given string, return true, otherwise false.

# Python3 program to check if a given string can
# be formed by concatenating inline elements
List #

from itertools import permutations

 

def checkList ( str , lst):

  for i in range ( 2 , len (lst) + 1 ):

for perm in permutations (lst, i):

if ’’ .join (perm) = = str :

return True

 

return False

 
# Driver code

< code class = "functions"> str = ’geeks’

lst = [ ’for’ , ’ge’ , ’abc’ , ’ ks’ , ’e’ , ’ xyz’ ]

print (checkList ( str , lst))

Exit:

 True 

Approach # 2: Python RegEx

# Python3 program for pro checks if a given string can
# be formed by combining string elements
List #

import re 

 

def checkList ( str , lst):

 

r = re. compile ( "(?:" + "|" . join (lst) + ") * $" )

if r.match ( str )! = None :

  return True

 

return False

 
# Driver code

str = ’geeks’

lst = [ ’for’ , ’ge’ , ’ abc’ , ’ks’ , ’ e’ ]

print (checkList ( str , lst))

Exit:

 True 

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