Adding 5 String algorithms

strings/anagram-check.py

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+# function to check if two strings are 
+# anagram or not  
+def check(s1, s2): 
+
+    # the sorted strings are checked  
+    if(sorted(s1)== sorted(s2)): 
+        print("The strings are anagrams.")  
+    else: 
+        print("The strings aren't anagrams.")          
+
+# driver code   
+s1 ="listen" #String 1
+s2 ="silent" #String 2
+check(s1, s2)

strings/k-frequent-words.py

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+# Python program to find the k most frequent words 
+# from data set 
+from collections import Counter 
+
+data_set = "" #Enter long string or paragraph here
+
+# split() returns list of all the words in the string 
+split_it = data_set.split() 
+
+# Pass the split_it list to instance of Counter class. 
+Counter = Counter(split_it) 
+
+# most_common() produces k frequently encountered 
+# input values and their respective counts. 
+most_occur = Counter.most_common(4) 
+
+print(most_occur) 

strings/pattern-match.py

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+# A Python program to demonstrate working 
+# of re.match(). 
+import re 
+
+# a sample function that uses regular expressions 
+# to find month and day of a date. 
+def findMonthAndDate(string): 
+
+    regex = r"([a-zA-Z]+) (\d+)"
+    match = re.match(regex, string) 
+
+    if match == None:  
+        print "Not a valid date"
+        return
+
+    print "Given Data: %s" % (match.group()) 
+    print "Month: %s" % (match.group(1)) 
+    print "Day: %s" % (match.group(2)) 
+
+
+# Driver Code 
+findMonthAndDate("" #Enter pattern to match) 
+print("") 
+findMonthAndDate("") #Enter string 

strings/substring-check.py

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+# function to check if small string is  
+# there in big string 
+def check(string, sub_str): 
+    if (string.find(sub_str) == -1): 
+        print("NO") 
+    else: 
+        print("YES") 
+
+# driver code 
+string = "" #Enter string
+sub_str ="" #Enter sub string
+check(string, sub_str)

strings/vowel-count.py

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+# Python3 code to count vowel in  
+# a string using set 
+
+# Function to count vowel 
+def vowel_count(str): 
+
+    # Intializing count variable to 0 
+    count = 0
+
+    # Creating a set of vowels 
+    vowel = set("aeiouAEIOU") 
+
+    # Loop to traverse the alphabet 
+    # in the given string 
+    for alphabet in str: 
+
+        # If alphabet is present 
+        # in set vowel 
+        if alphabet in vowel: 
+            count = count + 1
+
+    print("No. of vowels :", count) 
+
+# Driver code  
+str = "" #Enter string
+
+# Function Call 
+vowel_count(str)