JS: String.prototype.search

• s.search(/pattern/)
• s.search("pattern")

Return the index of first char of matched string. If no match, returns -1.

If the argument is a string, it is converted to a RegExp object.

[see JS: RegExp Object]

const xx = "joe@example.com";

console.log(xx.search(/@.+com/)); // 4

console.log(xx.search(/z/)); // -1
// not found

Here's typical use of “search” method in a “if” statement.

const txt = "dog1051cat";

// check contain digits
const result = txt.search(/\d+/);

if ( result !== -1) {
    console.log("found match");
    console.log(result); // 3
} else {
    console.log("not found");
}

Reference

ECMAScript® 2016 Language Specification#sec-string.prototype.search