@Rohith 

In this case you can use script processors(jython,groovy etc)  to do lookup on the files.

You can write code like below.

def search_str(file_path, word):

   with open(file_path, 'r') as file: # read all content of a file content = file.read() # check if string present in a file

     if word in content: print('string exist in a file') else: print('string does not exist in a file') search_str(r'E:\demos\files_demos\account\sales.txt', recode.value(‘patternstring’))

Thanks & Regards

Bikram_