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Web Technologies - JAVASCRIPT

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Lesson Description


Lession - #213 Javascript String Search

The search(>
method matches a string against a regular expression ** The search(>
method returns the index (position>
of the first match. The search(>
method returns - 1 assuming no match is found. The search(>
method is case sensitive.


JavaScript Search Mehods

  • String indexOf(>
  • String lastIndexOf(>
  • String startsWith(>
  • String endsWith(>
  • String search(>


    String indexOf(>

    The indexOf(>
    method returns the index of (the position of>
    the first occurence of a specified text in a string.


    String lastIndexOf(>

    The lastIndexOf(>
    method returns the index of the last occurrence of a specified text in a string

    Both above methods returns -1 if text not found

    String startsWith(>

    The startsWith(>
    technique decides if a string starts with the characters of a specified string, returning true or false.

    String endsWith(>

    The endsWith(>
    technique decides if a string ends with the characters of a specified string, returning true or false.

    String search(>

    The search(>
    method searches a string for a specified value and returns the position of the match.

    String match(>

    The match(>
    method searches a string for a match against a regular expression, and returns the matches, as an Array object.

    String includes(>

    The includes(>
    method returns true if a string contains a specified value.

    Let's see an example

    

<!DOCTYPE html>
<html>
<body>

<h2>JavaScript String search methods</h2>

<p id="demo"></p>
<p id="demo1"></p>

<script>
let text = "Hello world";
document.write("Text =">
    ;
document.write(text>
    ;
let result =  text.endsWith("world">
    ;
document.getElementById("demo">
    .innerHTML = result;


let text1 = "document verfied";
document.write("\n\r">
    ;
document.write("Text1=">
    ;
document.write(text1>
    ;
let s =  text1.startsWith("ver">
    ;
document.getElementById("demo1">
    .innerHTML = s;



var str="JavaScript is a scripting language. Scripting languages are often interpreted";
document.write("\n">
    ;
document.writeln(str.search(/Scripting/>
    >
    ; 
</script>

</body>
</html>

    Output


    Try it here

    • Javascript String Methods Javascript String Templates