How to search a specific word/string in whole big string and get index location through javascript

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M Farhan @ programming 2020-06-02 21:08:02

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How to search a specific word/string in whole big string and get index location through javascript

Hy. I want to match a word in whole big sentence and i want to get the index where it match in that sentence .Please help me.

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osama

Use str.search("you word") .It returns index value.

<script>
function searchFunction() {
       var str = "Visit significantbyte website!"; 
       var n = str.search("website");
      alert(n);
}
</script>

osama

If you want to get the exact word which you try to match.Use match function

<script>
function myFunction() {
  var str = "it is raining"; 
  var word = str.match("is");
  alert(word);
}
</script>

But match function is typically used for regular exression so it maybe not a better technique.

osama

str.indexOf also return index of matching substring.

<script>
function myFunction() {
  var str = "Hello world, welcome to the universe.";
  var n = str.indexOf("welcome");
  alert(n);
}
</script>

osama

OK If you donot know the word you are searching then to get last index you can use lastIndexOf() to get last index after you word.

<script>
function myFunction() {
  var str = "Hello planet earth, you are a great planet.";
  var n = str.lastIndexOf("planet");
  alert(n);
}
</script>

osama

There is a function (str.includes) who tells wheather your word is there in sentence OR not.It will return true if word exist otherwise it return false.

<script>
function myFunction() {
  var str = "Hello world, welcome to the universe.";
  var n = str.includes("world");
  alert(n);
}
</script>

osama

Test solutiom

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M Farhan
m.farhan0235@gmail.com

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M Farhan @ programming 2020-06-02 21:08:02

How to search a specific word/string in whole big string and get index location through javascript

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M Farhan m.farhan0235@gmail.com

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