---
title: String.prototype.search()
slug: Web/JavaScript/Reference/Global_Objects/String/search
translation_of: Web/JavaScript/Reference/Global_Objects/String/search
---
<div>{{JSRef}}</div>

<p><strong><code>search()</code></strong> 메서드는 정규 표현식과  이 {{jsxref("String")}}  객체간에 같은 것을 찾기<br>
 위한 검색을 실행한다.</p>

<div>{{EmbedInteractiveExample("pages/js/string-search.html")}}</div>



<h2 id="구문">구문</h2>

<pre class="syntaxbox"><var>str</var>.search(<var>regexp</var>)</pre>

<h3 id="매개변수">매개변수</h3>

<dl>
 <dt><code>regexp</code></dt>
 <dd>정규 표현식 객체.  non-RegExp 객체 <code>obj</code> 가 전달되면,  그것은  <code>new RegExp(obj)</code> 을 이용하여 {{jsxref("RegExp")}} 으로 암묵적으로 변환된다.</dd>
</dl>

<h3 id="반환_값">반환 값</h3>

<p>정규표현식과 주어진 스트링간에 첫번째로 매치되는 것의 인덱스를 반환한다.<br>
 찾지 못하면 <strong>-1</strong> 를 반환한다.</p>

<h2 id="설명">설명</h2>

<p>When you want to know whether a pattern is found and also its index in a string use <code>search()</code> (if you only want to know if it exists, use the similar {{jsxref("RegExp.prototype.test()", "test()")}} method on the RegExp prototype, which returns a boolean); for more information (but slower execution) use {{jsxref("String.prototype.match()", "match()")}} (similar to the regular expression {{jsxref("RegExp.prototype.exec()", "exec()")}} method).</p>

<h2 id="예">예</h2>

<h3 id="search()를_이용하기"><code>search()를 이용하기</code></h3>

<p>The following example searches a string with 2 different regex objects to show a successful search (positive value) vs. an unsuccessful search (-1)</p>

<pre class="brush: js">var str = "hey JudE";
var re = /[A-Z]/g;
var re2 = /[.]/g;
console.log(str.search(re)); // returns 4, which is the index of the first capital letter "J"
console.log(str.search(re2)); // returns -1 cannot find '.' dot punctuation</pre>

<h2 id="사양">사양</h2>

<table class="standard-table">
 <tbody>
  <tr>
   <th scope="col">사양</th>
   <th scope="col">상태</th>
   <th scope="col">주석</th>
  </tr>
  <tr>
   <td>{{SpecName('ES3')}}</td>
   <td>{{Spec2('ES3')}}</td>
   <td>Initial definition. Implemented in JavaScript 1.2.</td>
  </tr>
  <tr>
   <td>{{SpecName('ES5.1', '#sec-15.5.4.12', 'String.prototype.search')}}</td>
   <td>{{Spec2('ES5.1')}}</td>
   <td> </td>
  </tr>
  <tr>
   <td>{{SpecName('ES6', '#sec-string.prototype.search', 'String.prototype.search')}}</td>
   <td>{{Spec2('ES6')}}</td>
   <td> </td>
  </tr>
  <tr>
   <td>{{SpecName('ESDraft', '#sec-string.prototype.search', 'String.prototype.search')}}</td>
   <td>{{Spec2('ESDraft')}}</td>
   <td> </td>
  </tr>
 </tbody>
</table>

<h2 id="브라우저_호환성">브라우저 호환성</h2>

<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>

<p>{{Compat("javascript.builtins.String.search")}}</p>

<h2 id="Gecko-specific_notes">Gecko-specific notes</h2>

<ul>
 <li><code>flags</code> was a non standard second argument only available in Gecko : <var>str</var>.search(<var>regexp, flags</var>)</li>
 <li>Prior to {{Gecko("8.0")}}, <code>search()</code> was implemented incorrectly; when it was called with no parameters or with {{jsxref("undefined")}}, it would match against the string 'undefined', instead of matching against the empty string. This is fixed; now <code>'a'.search()</code> and <code>'a'.search(undefined)</code> correctly return 0.</li>
 <li>Starting with Gecko 39 {{geckoRelease(39)}}, the non-standard <code>flags</code> argument is deprecated and throws a console warning ({{bug(1142351)}}).</li>
 <li>Starting with Gecko 47 {{geckoRelease(47)}}, the non-standard <code>flags</code> argument is no longer supported in non-release builds and will soon be removed entirely ({{bug(1245801)}}).</li>
 <li>Starting with Gecko 49 {{geckoRelease(49)}}, the non-standard <code>flags</code> argument is no longer supported ({{bug(1108382)}}).</li>
</ul>

<h2 id="See_also">See also</h2>

<ul>
 <li>{{jsxref("String.prototype.match()")}}</li>
 <li>{{jsxref("RegExp.prototype.exec()")}}</li>
</ul>