search() is a built-in function in How to use search method, which can be used to search for matching objects between regular expressions and given string objects. In this article, we will take a closer look at the search method. Basic usage.
First let’s take a look at the basic syntax of the search method
string.search(regexp);
regexp represents a regular expression object. If a non-RegExp object obj is passed, it is implicitly converted to a RegExp using new RegExp(obj).
search() returns the index of the first match between the regular expression and the given string object, or -1 if no match is found.
Let’s look at a specific example
The code is as follows
<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<script>
// 输入一个字符串
var string = "GeeksforGeeks";
// 获取正则表达式
var re1 = /G/;
var re2 = /e/;
var re3 = /s/;
var re4 = /, /;
// 输出匹配字母的索引
document.write(string.search(re1) + "<br>");
document.write(string.search(re2) + "<br>");
document.write(string.search(re3)+"<br>");
document.write(string.search(re4));
</script>
</body>
</html>The results displayed on the browser are as follows: re4 does not find a match, so -1 is returned.
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