JS: String.prototoype.search

By Xah Lee. Date: . Last updated: .

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.

var xx = "jane@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. Note that you should check against -1.

var xlink = "http://google.com/";

var search_result = xlink.search(/oo/);

if ( search_result !== -1) {
    console.log("found match");
    console.log(search_result); // 8
} else {
    console.log("not found");


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

RegExp Topic

  1. JS: RegExp Tutorial
  2. JS: String Methods for RegExp
  3. JS: RegExp Object
  4. JS: RegExp Constructor
  5. JS: RegExp.prototype
  6. JS: RegExp Syntax

String Topic

  1. JS: Source Code Charset/Encoding
  2. JS: String Code Unit vs Code Point
  3. JS: Unicode Character Escape Sequence
  4. JS: Allowed Characters in Identifier
  5. HTML: Allowed Characters in id Attribute
  6. HTML: Character Sets and Encoding
  7. HTML/XML Entity List

  1. JS: Template String
  2. JS: Convert String to Number
  3. JS: Encode URL, Escape String
  4. JS: Format Number
  5. JS: JSON Object

  1. JS: String Object
  2. JS: String.prototype
  3. JS: String Constructor
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