I want to find the number of occurrence of particular word in a string.
I have searched online and found many answers like
But none of them gave me accurate result.
What I want is:
Input:
I have asked the question in StackOverflow. Therefore i can expect answer here.
Output for "The" keyword:
The keyword count: 2
Note: It should not consider "The" from "Therefore" in a sentence.
Basically I want to match whole word and get the count.
Try like this
var searchText=" the ";
var input="I have asked the question in StackOverflow. Therefore i can expect answer here.";
var arr=input.Split(new char[]{' ','.'});
var count=Array.FindAll(arr, s => s.Equals(searchText.Trim())).Length;
Console.WriteLine(count);
EDIT
For your Search Sentence
var sentence ="I have asked the question in StackOverflow. Therefore i can expect answer here.";
var searchText="have asked";
char [] split=new char[]{',',' ','.'};
var splitSentence=sentence.ToLower().Split(split);
var splitText=searchText.ToLower().Split(split);
Console.WriteLine("Search Sentence {0}",splitSentence.Length);
Console.WriteLine("Search Text {0}",splitText.Length);
var count=0;
for(var i=0;i<splitSentence.Length;i++){
if(splitSentence[i]==splitText[0]){
var index=i;
var found=true;
var j=0;
for( j=0;j<splitText.Length;j++){
if(splitSentence[index++]!=splitText[j])
{
found=false;
break;
}
}
if(found){
Console.WriteLine("Index J {0} ",j);
count++;
i= index >i ? index-1 : i;
}
}
}
Console.WriteLine("Total found {0} substring",count);
A possible solution would be using Regex:
var count = Regex.Matches(input.ToLower(), String.Format("\b{0}\b", "the")).Count;
try Like this (Way 1)
string SpecificWord = " the ";
string sentence = "I have asked the question in StackOverflow. Therefore i can expect answer here.";
int count = 0;
foreach (Match match in Regex.Matches(sentence, SpecificWord, RegexOptions.IgnoreCase))
{
count++;
}
Console.WriteLine("{0}" + " Found " + "{1}" + " Times", SpecificWord, count);
or Like this (Way 2)
string SpecificWord = " the ";
string sentence = "I have asked the question in StackOverflow. Therefore i can expect answer here.";
int WordPlace = sentence.IndexOf(SpecificWord);
Console.WriteLine(sentence);
int TimesRep;
for (TimesRep = 0; WordPlace > -1; TimesRep++)
{
sentence = (sentence.Substring(0, WordPlace) +sentence.Substring(WordPlace +SpecificWord.Length)).Replace(" ", " ");
WordPlace = sentence.IndexOf(SpecificWord);
}
Console.WriteLine("this word Found " + TimesRep + " time");
You can use while loop to search index of the first occurrence, after that give search from found index ++ position and set one counter at the end of the loop. While loop goes untill index == -1.
Try like this
string Text = "I have asked the question in StackOverflow. Therefore i can expect answer here.";
Text = Text.ToLower();
Dictionary<string, int> frequencies = null;
frequencies = new Dictionary<string, int>();
string[] words = Regex.Split(Text, "\\W+");
foreach (string word in words)
{
if (frequencies.ContainsKey(word))
{
frequencies[word] += 1;
}
else
{
frequencies[word] = 1;
}
}
foreach (KeyValuePair<string, int> entry in frequencies)
{
string word = entry.Key;
int frequency = entry.Value;
Response.Write(word.ToString() + "," + frequency.ToString()+"</br>");
}
And To search Specific Word then try Like This.
string Text = "I have asked the question in StackOverflow. Therefore the i can expect answer here.";
Text = Text.ToLower();
string searchtext = "the";
searchtext = searchtext.ToLower();
string[] words = Regex.Split(Text, "\\W+");
foreach (string word in words)
{
if (searchtext.Equals(word))
{
count = count + 1;
}
else
{
}
}
Response.Write(count);
Well the problem is not that simple you may think; there are many issues should be taken care of such as punctuation, letter case, and things like how word boundaries are identified. However using N_Gram concept I provide the following solution:
1- Identify how many words are in the key. Name it as N
2- Extract all N-consecutive sequence of words (N_Grams) in the text.
3- Count the occurrence of key in N_Grams
string text = "I have asked the question in StackOverflow. Therefore i can expect answer here.";
string key = "the question";
int gram = key.Split(' ').Count();
var parts = text.Split(' ');
List<string> n_grams = new List<string>();
for (int i = 0; i < parts.Count(); i++)
{
if (i <= parts.Count() - gram)
{
string sequence = "";
for (int j = 0; j < gram; j++)
{
sequence += parts[i + j] + " ";
}
if (sequence.Length > 0)
sequence = sequence.Remove(sequenc.Count() - 1, 1);
n_grams.Add(sequence);
}
}
// The result
int count = n_grams.Count(p => p == key);
}
For example for the key = the question and considering single space as word boundaries, the following bi-grams are extracted:
I have
have asked
asked the
the question
question in
in StackOverflow.
StackOverflow. Therefore
Therefore i
i can
can expect
expect answer
answer here.
and the number of times the question appears in the text is not obvious to see: 1
This solution should work wherever the string is:
var str = "I have asked the question in StackOverflow. Therefore i can expect answer here.";
var numMatches = Regex.Matches(str.ToUpper(), "THE")
.Cast<Match>()
.Count(match =>
(match.Index == 0 || str[match.Index - 1] == ' ') &&
(match.Index + match.Length == str.Length ||
!Regex.IsMatch(
str[match.Index + match.Length].ToString(),
"[a-zA-Z]")));
string input = "I have asked the question in StackOverflow. Therefore i can expect answer here.";
string pattern = @"\bthe\b";
var matches = Regex.Matches(input, pattern, RegexOptions.IgnoreCase);
Console.WriteLine(matches.Count);
See Regex Anchors - "\b".
There are many possibility for Count occurrence of whole word in a string.
E.g.
First:
string name = "pappu kumar sdffnsd sdfnsdkfbsdf sdfjnsd fsdjkn fsdfsd sdfsd pappu kumar";
var res= name.Contains("pappu kumar");
var splitval = name.Split("pappu kumar").Length-1;
Second:
var r = Regex.Matches(name, "pappu kumar").Count;
What about (seems more efficency then other solutions):
public static int CountOccurences(string haystack, string needle)
{
return (haystack.Length - haystack.Replace(needle, string.Empty).Length) / needle.Length;
}
Try out this works for structured data as well.
var splitStr = inputStr.Split(' ');
int result_count = splitStr.Count(str => str.Contains("userName"));
