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How to use search() in javascript

青灯夜游Original: 2021-12-29 18:13:334048browse

In JavaScript, the search() method is used to retrieve a specified substring in a string, or to retrieve a substring that matches a regular expression, and returns the position of the first occurrence of the substring. The syntax "string .search(searchvalue)"; if no matching substring is found, "-1" is returned.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

javascript search() method--search string

The search() method is used to retrieve the specified substring in the string, Or retrieve a substring that matches a regular expression.

Syntax:

string.search(searchvalue)

Parameter description:

##searchvalue Required. The string or regular expression to search for.

Return value:

Returns the String object that matches the specified search string or regular expression. starting position.
If no matching substring is found, -1 is returned.

Example:

Perform a case-sensitive search

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>

<p id="demo">单击显示查找的位置</p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction(){
	var str="Mr. Blue has a blue house"
	var n=str.search("blue");
	document.getElementById("demo").innerHTML=n;
}
</script>

</body>
</html>

How to use search() in javascript ## Perform a case-ignoring search

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>

<p id="demo">单击显示查找的位置</p>
<button onclick="myFunction()">点我</button>
<script>
function myFunction(){
	var str="Mr. Blue has a blue house"
	var n=str.search(/blue/i);
	document.getElementById("demo").innerHTML=n;
}
</script>

</body>
</html>

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