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<title>strstr</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-c_string_byte_strstr skin-cppreference2 action-view cpp-navbar">
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<div id="contentSub"><span class="subpages">&lt; <a href="c.html">c</a>&lrm; | <a href="c-string.html">string</a>&lrm; | <a href="c-string-byte.html">byte</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code>&lt;string.h&gt;</code></div>
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<div><span class="mw-geshi c source-c"><span class="kw4">char</span> <span class="sy2">*</span>strstr<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> str, <span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> substr <span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>&#26597;&#25214; <code>substr</code> &#25152;&#25351;&#30340;&#31354;&#32456;&#27490;&#23383;&#33410;&#23383;&#31526;&#20018;&#22312; <code>str</code> &#25152;&#25351;&#30340;&#31354;&#32456;&#27490;&#23383;&#33410;&#23383;&#31526;&#20018;&#20013;&#30340;&#39318;&#27425;&#20986;&#29616;&#12290;&#19981;&#27604;&#36739;&#31354;&#32456;&#27490;&#23383;&#31526;&#12290;</p>
<p>&#33509; <code>str</code> &#25110; <code>substr</code> &#19981;&#26159;&#25351;&#21521;&#31354;&#32456;&#27490;&#23383;&#33410;&#23383;&#31526;&#20018;&#30340;&#25351;&#38024;&#65292;&#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>str</td>
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<td>&#25351;&#21521;&#35201;&#26816;&#39564;&#30340;&#31354;&#32456;&#27490;&#23383;&#33410;&#23383;&#31526;&#20018;&#30340;&#25351;&#38024;</td>
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<td>substr</td>
<td>-</td>
<td>&#25351;&#21521;&#35201;&#26597;&#25214;&#30340;&#31354;&#32456;&#27490;&#23383;&#33410;&#23383;&#31526;&#20018;&#30340;&#25351;&#38024;</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#25351;&#21521;&#20110; <code>str</code> &#20013;&#25214;&#21040;&#30340;&#23376;&#20018;&#39318;&#23383;&#31526;&#30340;&#25351;&#38024;&#65292;&#25110;&#33509;&#25214;&#19981;&#21040;&#35813;&#23376;&#20018;&#21017;&#20026;&#31354;&#25351;&#38024;&#12290;&#33509; <code>substr</code> &#25351;&#21521;&#31354;&#23383;&#31526;&#20018;&#65292;&#21017;&#36820;&#22238; <code>str</code> &#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<pre class="de1"><span class="co2">#include &lt;string.h&gt;</span>
<span class="co2">#include &lt;stdio.h&gt;</span>
<span class="kw4">void</span> find_str<span class="br0">(</span><span class="kw4">char</span> <span class="kw4">const</span><span class="sy2">*</span> str, <span class="kw4">char</span> <span class="kw4">const</span><span class="sy2">*</span> substr<span class="br0">)</span>
<span class="br0">{</span>
<span class="kw4">char</span><span class="sy2">*</span> pos <span class="sy1">=</span> strstr<span class="br0">(</span>str, substr<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span><span class="br0">(</span>pos<span class="br0">)</span> <span class="br0">{</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;found the string &#39;%s&#39; in &#39;%s&#39; at position: %ld<span class="es1">\n</span>&quot;</span>, substr, str, pos <span class="sy2">-</span> str<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span> <span class="kw1">else</span> <span class="br0">{</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;the string &#39;%s&#39; was not found in &#39;%s&#39;<span class="es1">\n</span>&quot;</span>, substr, str<span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span>
<span class="br0">}</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw4">char</span><span class="sy2">*</span> str <span class="sy1">=</span> <span class="st0">&quot;one two three&quot;</span><span class="sy4">;</span>
find_str<span class="br0">(</span>str, <span class="st0">&quot;two&quot;</span><span class="br0">)</span><span class="sy4">;</span>
find_str<span class="br0">(</span>str, <span class="st0">&quot;&quot;</span><span class="br0">)</span><span class="sy4">;</span>
find_str<span class="br0">(</span>str, <span class="st0">&quot;nine&quot;</span><span class="br0">)</span><span class="sy4">;</span>
find_str<span class="br0">(</span>str, <span class="st0">&quot;n&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">return</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
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<pre class="de1">found the string &#39;two&#39; in &#39;one two three&#39; at position: 4
found the string &#39;&#39; in &#39;one two three&#39; at position: 0
the string &#39;nine&#39; was not found in &#39;one two three&#39;
found the string &#39;n&#39; in &#39;one two three&#39; at position: 1</pre></div>
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<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">&#24341;&#29992;</span></h3>
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<ul>
<li>C11 &#26631;&#20934;&#65288;ISO/IEC 9899:2011&#65289;&#65306;</li>
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<li>7.24.5.7 The strstr function (p: 369)</li>
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<li>C99 &#26631;&#20934;&#65288;ISO/IEC 9899:1999&#65289;&#65306;</li>
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<li>7.21.5.7 The strstr function (p: 332)</li>
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<li>C89/C90 &#26631;&#20934;&#65288;ISO/IEC 9899:1990&#65289;&#65306;</li>
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<li>4.11.5.7 The strstr function</li>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div><a href="c-string-byte-strchr.html"><span class="t-lines"><span>strchr</span></span></a></div>
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<td>&#26597;&#25214;&#23383;&#31526;&#30340;&#39318;&#27425;&#20986;&#29616;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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<div><a href="c-string-byte-strrchr.html"><span class="t-lines"><span>strrchr</span></span></a></div>
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<td>&#26597;&#25214;&#23383;&#31526;&#30340;&#26368;&#21518;&#19968;&#27425;&#20986;&#29616;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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