JS: String.prototype.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.

[see JS: RegExp Object]

const 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.

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

RegExp Topic

  1. JS: RegExp Tutorial
  2. JS: RegExp Syntax
  3. JS: Regex Find/Replace
  4. JS: RegExp Object
  5. JS: RegExp Constructor
  6. JS: RegExp.prototype

String Topic

  1. JS: String Overview
  2. JS: Template String
  3. JS: String Object
  4. JS: String.prototype
  5. JS: String Code Unit vs Code Point
  6. JS: String Escape Sequence
  7. JS: Unicode Escape Sequence
  8. JS: Source Code Encoding
  9. JS: Allowed Characters in Identifier
  10. JS: Convert String to Number
  11. JS: Encode URL, Escape String
  12. JS: Format Number
  13. JS: JSON
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