JavaScript - search() method

revision:

Category : string

The search() method matches a string against a regular expression and returns the index (position) of the first match. It returns -1 if no match is found. The search() method is case sensitive.

If the search value is a string, it is converted to a regular expression.

Syntax : 

        string.search(searchValue)

Parameters:

searchvalue : required. The search value. A regular expression (or a string that will be converted to a regular expression).

Examples:

            <p>search() searches a string for a value and returns the position of the first match:</p>
            <p id="demo"></p>
            <script>
                let text = "Mr. Blue has a blue house"
                let position = text.search("Blue");
                document.getElementById("demo").innerHTML = position;
            </script>

Practical examples

example: search for "Blue" or "blue" or . . .

code: 
                    <div>
                        <p id="search-1"></p>
                        <p id="search-2"></p>
                        <p id="search-3"></p>
                        <p id="search-4"></p>
                        <p id="search-5"></p>
                        <p id="search-6"></p>
                    </div>
                    <script>
                        let text = "Mr. Blue has a blue house"
                        document.getElementById("search-1").innerHTML = "sentence : " + text;
                        let position = text.search("Blue");
                        document.getElementById("search-2").innerHTML = "position 'Blue' : " + position;
                        let position2 = text.search("blue");
                        document.getElementById("search-3").innerHTML = "position 'blue' : " + position2;
                        let position3 = text.search(/Blue/);
                        document.getElementById("search-4").innerHTML = "position '/Blue/' : " + position3;
                        let position4 = text.search(/blue/);
                        document.getElementById("search-5").innerHTML = "position '/blue/' : " + position4;
                        let position5= text.search(/blue/i);
                        document.getElementById("search-6").innerHTML = "position '/blue/i' : " + position5;
            
                    </script>