Update lcs.py

lcs.py

@@ -8,7 +8,8 @@ def find_common_subsequences(sentence, str_list):
     str_list = [s.lower() for s in str_list]
 
     def is_present(subseq, str_list):
-        return all(subseq in s for s in str_list)
+        subseq_regex = re.compile(r'\b' + re.escape(subseq) + r'\b')
+        return all(subseq_regex.search(s) for s in str_list)
 
     def remove_stop_words_and_special_chars(sentence):
         sentence = re.sub(r'[^\w\s]', '', sentence)
@@ -33,3 +34,4 @@ def find_common_subsequences(sentence, str_list):
                 index += 1
 
     return common_grams
+