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                    <section class="normal" id="section-">

                        <h1 id="regex">Regex</h1>
<p>regex &#xB9E4;&#xCE6D;&#xC740; <code>~</code> &#xC5F0;&#xC0B0;&#xC790;&#xB97C; &#xC0AC;&#xC6A9;&#xD569;&#xB2C8;&#xB2E4;.
awk &#xC5D0;&#xC11C; regex &#xB97C; &#xC791;&#xC131;&#xD558;&#xB294; &#xBC29;&#xBC95;&#xC740; regex &#xC0C1;&#xC218; (<code>/.../</code>) &#xC744; &#xC774;&#xC6A9;&#xD558;&#xB294; &#xBC29;&#xBC95;&#xACFC;
&#xC2A4;&#xD2B8;&#xB9C1;&#xC744; &#xC774;&#xC6A9;&#xD558;&#xB294; &#xBC29;&#xBC95; &#xB450; &#xAC00;&#xC9C0;&#xAC00; &#xC788;&#xC2B5;&#xB2C8;&#xB2E4;.
&#xAE30;&#xBCF8;&#xC801;&#xC73C;&#xB85C; <a href="https://mug896.github.io/sed-stream-editor/regex.html" target="_blank">extended regular expression</a> &#xC744; &#xC0AC;&#xC6A9;&#xD558;&#xBBC0;&#xB85C;
regex &#xC5D0;&#xC11C; &#xC0AC;&#xC6A9;&#xD558;&#xB294; <code>?</code>, <code>+</code>, <code>( )</code>, <code>{ }</code>, <code>|</code> &#xBB38;&#xC790;&#xB4E4;&#xC744; escape &#xD560; &#xD544;&#xC694;&#xAC00; &#xC5C6;&#xC2B5;&#xB2C8;&#xB2E4;.</p>
<h4 id="regex-&#xC0C1;&#xC218;--&#xB97C;-&#xC774;&#xC6A9;&#xD558;&#xB294;-&#xBC29;&#xBC95;">regex &#xC0C1;&#xC218; <code>/.../</code> &#xB97C; &#xC774;&#xC6A9;&#xD558;&#xB294; &#xBC29;&#xBC95;</h4>
<ul>
<li><p><code>~</code> &#xC5F0;&#xC0B0;&#xC790;&#xB97C; &#xC0AC;&#xC6A9;&#xD558;&#xC9C0; &#xC54A;&#xACE0; &#xB2E8;&#xB3C5;&#xC73C;&#xB85C; &#xC0AC;&#xC6A9;&#xD560; &#xC218; &#xC788;&#xB294;&#xB370; &#xADF8;&#xB7F4; &#xACBD;&#xC6B0; &#xAE30;&#xBCF8;&#xC801;&#xC73C;&#xB85C; <code>$0</code> &#xACFC; &#xB9E4;&#xCE6D;&#xD569;&#xB2C8;&#xB2E4;.</p>
</li>
<li><p>&#xC2DD; &#xB0B4;&#xC5D0;&#xC11C; &#xAE30;&#xBCF8;&#xC801;&#xC73C;&#xB85C; escape &#xBB38;&#xC790;&#xAC00; &#xCC98;&#xB9AC;&#xB429;&#xB2C8;&#xB2E4;.</p>
</li>
<li><p><code>/</code> or <code>\</code> &#xBB38;&#xC790;&#xB97C; &#xC2DD;&#xC5D0; &#xC0AC;&#xC6A9;&#xD558;&#xB824;&#xBA74; escape &#xD569;&#xB2C8;&#xB2E4;.</p>
</li>
<li><p>regex &#xC0C1;&#xC218; &#xB77C;&#xACE0;&#xB3C4; &#xD558;&#xACE0; &#xBCC0;&#xC218;&#xB97C; &#xC0AC;&#xC6A9;&#xD558;&#xC9C0; &#xBABB;&#xD558;&#xB294; &#xB2E8;&#xC810;&#xC774; &#xC788;&#xC2B5;&#xB2C8;&#xB2E4;.</p>
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</ul>
<pre><code class="lang-bash"><span class="hljs-comment"># /.../ &#xC5D0;&#xC11C; &apos;\t&apos; escape &#xBB38;&#xC790;&#xAC00; &#xCC98;&#xB9AC;&#xB418;&#xC5B4; &#xB9E4;&#xCE6D;&#xC774; &#xB41C;&#xB2E4;.</span>
$ <span class="hljs-built_in">echo</span> <span class="hljs-operator">-e</span> <span class="hljs-string">&apos;111\t222:333\t444&apos;</span> | awk -F: <span class="hljs-string">&apos;$1 ~ /11\t22/ { print $1 }&apos;</span>
<span class="hljs-number">111</span>    <span class="hljs-number">222</span>

$ <span class="hljs-built_in">echo</span> <span class="hljs-string">&apos;/&apos;</span> | awk <span class="hljs-string">&apos;///{ print }&apos;</span>        <span class="hljs-comment"># ERROR</span>

$ <span class="hljs-built_in">echo</span> <span class="hljs-string">&apos;/&apos;</span> | awk <span class="hljs-string">&apos;/\//{ print }&apos;</span>       <span class="hljs-comment"># OK</span>
/

$ <span class="hljs-built_in">echo</span> <span class="hljs-string">&apos;\&apos;</span> | awk <span class="hljs-string">&apos;/\/{ print }&apos;</span>        <span class="hljs-comment"># ERROR</span>

$ <span class="hljs-built_in">echo</span> <span class="hljs-string">&apos;\&apos;</span> | awk <span class="hljs-string">&apos;/\\/{ print }&apos;</span>       <span class="hljs-comment"># OK</span>
\

$ <span class="hljs-built_in">echo</span> <span class="hljs-string">&apos;\&apos;</span> | awk <span class="hljs-string">&apos;/[\]/{ print }&apos;</span>      <span class="hljs-comment"># ERROR</span>

$ <span class="hljs-built_in">echo</span> <span class="hljs-string">&apos;\&apos;</span> | awk <span class="hljs-string">&apos;/[\\]/{ print }&apos;</span>     <span class="hljs-comment"># OK</span>
\

<span class="hljs-comment"># &apos;~&apos; &#xC5F0;&#xC0B0;&#xC790;&#xB97C; &#xC0AC;&#xC6A9;&#xD558;&#xC9C0; &#xC54A;&#xACE0; &#xB3C5;&#xB9BD;&#xC801;&#xC73C;&#xB85C; &#xC0AC;&#xC6A9;&#xD558;&#xBA74; &#xAE30;&#xBCF8;&#xC801;&#xC73C;&#xB85C; &apos;$0&apos; &#xC640; &#xB9E4;&#xCE6D;&#xC744; &#xD569;&#xB2C8;&#xB2E4;.</span>
<span class="hljs-comment"># &#xB530;&#xB77C;&#xC11C; &#xB2E4;&#xC74C; &#xC608;&#xB294; awk &apos;$0 ~ /^foobar$/ ...&apos; &#xC640; &#xB3D9;&#xC77C;&#xD569;&#xB2C8;&#xB2E4;.</span>
$ <span class="hljs-built_in">echo</span> <span class="hljs-string">&apos;foobar&apos;</span> | awk <span class="hljs-string">&apos;/^foobar$/ { print }&apos;</span>
foobar
$ <span class="hljs-built_in">echo</span> <span class="hljs-string">&apos;foobar&apos;</span> | awk <span class="hljs-string">&apos;{ if ( /^foobar$/ ) print }&apos;</span>
foobar

<span class="hljs-comment"># &#xB2E4;&#xC74C; &#xB450; &#xC2DD;&#xC740; &#xACB0;&#xACFC;&#xC801;&#xC73C;&#xB85C; &#xB3D9;&#xC77C;&#xD569;&#xB2C8;&#xB2E4;.</span>
<span class="hljs-comment"># &#xB9E4;&#xCE6D;&#xC774; &#xC131;&#xACF5;&#xD558;&#xC5EC; &#xAC12; 1 &#xC774; AA &#xBCC0;&#xC218;&#xC5D0; &#xB300;&#xC785;&#xB429;&#xB2C8;&#xB2E4;.</span>
$ <span class="hljs-built_in">echo</span> <span class="hljs-string">&apos;foobar&apos;</span> | awk <span class="hljs-string">&apos;{ AA = /^foobar$/;  print AA }&apos;</span>
<span class="hljs-number">1</span>
$ <span class="hljs-built_in">echo</span> <span class="hljs-string">&apos;foobar&apos;</span> | awk <span class="hljs-string">&apos;{ AA = ( $0 ~ /^foobar$/ );  print AA }&apos;</span>
<span class="hljs-number">1</span>
<span class="hljs-comment"># &#xB9E4;&#xCE6D;&#xC774; &#xC2E4;&#xD328;&#xD560; &#xACBD;&#xC6B0;&#xB294; 0 &#xC774; &#xB300;&#xC785;&#xB428;</span>
$ <span class="hljs-built_in">echo</span> <span class="hljs-string">&apos;foobar&apos;</span> | awk <span class="hljs-string">&apos;{ AA = /^fooxxx$/;  print AA }&apos;</span>
<span class="hljs-number">0</span>
</code></pre>
<h4 id="&#xC2A4;&#xD2B8;&#xB9C1;&#xC744;-&#xC774;&#xC6A9;&#xD558;&#xB294;-&#xBC29;&#xBC95;">&#xC2A4;&#xD2B8;&#xB9C1;&#xC744; &#xC774;&#xC6A9;&#xD558;&#xB294; &#xBC29;&#xBC95;</h4>
<ul>
<li><p>&#xC2A4;&#xD2B8;&#xB9C1;&#xC744; &#xC774;&#xC6A9;&#xD558;&#xBA74; regex &#xC2DD; &#xB0B4;&#xC5D0; &#xBCC0;&#xC218;&#xB97C; &#xC0AC;&#xC6A9;&#xD560; &#xC218; &#xC788;&#xACE0;
&#xB610;&#xD55C; regex &#xC2DD; &#xC790;&#xCCB4;&#xB97C; &#xBCC0;&#xC218;&#xC5D0; &#xB300;&#xC785;&#xD574; &#xC0AC;&#xC6A9;&#xD560; &#xC218;&#xB3C4; &#xC788;&#xC2B5;&#xB2C8;&#xB2E4;.</p>
</li>
<li><p>&#xB2E8;&#xB3C5;&#xC73C;&#xB85C; &#xC0AC;&#xC6A9;&#xD560; &#xC218; &#xC5C6;&#xACE0; &#xD56D;&#xC0C1; <code>~</code> &#xC5F0;&#xC0B0;&#xC790;&#xC640; &#xD568;&#xAED8; &#xC0AC;&#xC6A9;&#xD574;&#xC57C; &#xD569;&#xB2C8;&#xB2E4;.</p>
</li>
<li><p>&#xC2A4;&#xD2B8;&#xB9C1;&#xC744; &#xC774;&#xC6A9;&#xD558;&#xB294; &#xBC29;&#xBC95;&#xC758; &#xB2E8;&#xC810;&#xC740; regex &#xC0C1;&#xC218;&#xC5D0; &#xBE44;&#xD574; escape &#xCC98;&#xB9AC;&#xAC00; &#xBCF5;&#xC7A1;&#xD558;&#xB2E4;&#xB294; &#xC810;&#xC785;&#xB2C8;&#xB2E4;.</p>
</li>
</ul>
<pre><code class="lang-bash"><span class="hljs-comment"># &#xC2A4;&#xD2B8;&#xB9C1;&#xC744; &#xC774;&#xC6A9;&#xD558;&#xBA74; &#xC2DD; &#xB0B4;&#xC5D0;&#xC11C; &#xBCC0;&#xC218;&#xB97C; &#xC0AC;&#xC6A9;&#xD560; &#xC218; &#xC788;&#xC2B5;&#xB2C8;&#xB2E4;.</span>
$ <span class="hljs-built_in">echo</span> <span class="hljs-string">&apos;foobar&apos;</span> | awk <span class="hljs-string">&apos;{ var = &quot;ob&quot;; if ( $0 ~ &quot;^fo&quot; var &quot;ar$&quot; ) print }&apos;</span>
foobar

<span class="hljs-comment"># regex &#xC2DD; &#xC790;&#xCCB4;&#xB97C; &#xBCC0;&#xC218;&#xC5D0; &#xB123;&#xC5B4; &#xC0AC;&#xC6A9;&#xD560; &#xC218;&#xB3C4; &#xC788;&#xC2B5;&#xB2C8;&#xB2E4;.</span>
$ <span class="hljs-built_in">echo</span> <span class="hljs-string">&apos;foobar&apos;</span> | awk <span class="hljs-string">&apos;{ regex = &quot;^foobar$&quot;; if ( $0 ~ regex ) print }&apos;</span>
foobar
</code></pre>
<p>&#xB2E4;&#xC74C;&#xC740; &#xC2DD;&#xC744; &#xC791;&#xC131;&#xD560; &#xB54C; regex &#xC0C1;&#xC218;&#xC640; &#xC2A4;&#xD2B8;&#xB9C1;&#xC758; &#xCC28;&#xC774;&#xC810;&#xC744; &#xBCF4;&#xC5EC;&#xC90D;&#xB2C8;&#xB2E4;.<br>&#xC2A4;&#xD2B8;&#xB9C1;&#xC73C;&#xB85C; &#xC791;&#xC131;&#xD560; &#xB54C;&#xB294; <code>/.../</code> &#xC548;&#xC5D0; &#xB4E4;&#xC5B4;&#xAC00;&#xB294; &#xC2A4;&#xD2B8;&#xB9C1;&#xACFC; &#xB3D9;&#xC77C;&#xD558;&#xAC8C; &#xB418;&#xB3C4;&#xB85D; &#xB9CC;&#xB4E4;&#xC5B4;&#xC900;&#xB2E4;&#xACE0; &#xC0DD;&#xAC01;&#xD558;&#xBA74; &#xB429;&#xB2C8;&#xB2E4;.</p>
<pre><code class="lang-bash"><span class="hljs-comment"># regex &#xC0C1;&#xC218;&#xB85C; &#xC791;&#xC131;&#xD55C; &#xACBD;&#xC6B0;</span>
$ <span class="hljs-built_in">echo</span> <span class="hljs-string">&apos;&quot;111\222&quot;:&quot;333\444&quot;&apos;</span> | awk -F: <span class="hljs-string">&apos;$1 ~ /&quot;111\\222&quot;/ { print $1 }&apos;</span>
<span class="hljs-string">&quot;111\222&quot;</span>

<span class="hljs-comment"># &#xB3D9;&#xC77C;&#xD55C; &#xC2DD;&#xC744; &#xC2A4;&#xD2B8;&#xB9C1;&#xC73C;&#xB85C; &#xB9CC;&#xB4E4; &#xACBD;&#xC6B0;</span>
<span class="hljs-comment"># &#xBA3C;&#xC800; double quotes &#xC740; &quot; &quot; &#xB0B4;&#xC5D0;&#xC11C; escape &#xD574;&#xC57C; &#xD558;&#xBBC0;&#xB85C; \&quot; &#xB85C; &#xC791;&#xC131;&#xD558;&#xACE0;</span>
<span class="hljs-comment"># &apos;\\&apos; &#xB97C; &#xB9CC;&#xB4E4;&#xB824;&#xBA74; &apos;\&apos; &#xBB38;&#xC790;&#xB294; escape &#xD574;&#xC57C; &#xD558;&#xBBC0;&#xB85C; &apos;\\\\&apos; &#xB85C; &#xC791;&#xC131;&#xD574;&#xC57C; &#xD569;&#xB2C8;&#xB2E4;.</span>
$ <span class="hljs-built_in">echo</span> <span class="hljs-string">&apos;&quot;111\222&quot;:&quot;333\444&quot;&apos;</span> | awk -F: <span class="hljs-string">&apos;$1 ~ &quot;\&quot;111\\\\222\&quot;&quot; { print $1 }&apos;</span>
<span class="hljs-string">&quot;111\222&quot;</span>
</code></pre>
<h3 id="regular-expression-extensions">Regular expression Extensions</h3>
<p>sed &#xC5D0;&#xC11C;&#xB294; word boundary &#xC640; &#xAD00;&#xB828;&#xD574;&#xC11C;  <code>\b</code>, <code>\B</code> &#xB97C; &#xC0AC;&#xC6A9;&#xD558;&#xB294;&#xB370; awk &#xC5D0;&#xC11C;&#xB294; <code>\y</code>, <code>\B</code> &#xB97C; &#xC0AC;&#xC6A9;&#xD569;&#xB2C8;&#xB2E4;.<br>(<code>\b</code> &#xB294; backspace escape &#xBB38;&#xC790;&#xB85C; &#xC0AC;&#xC6A9;&#xB429;&#xB2C8;&#xB2E4;.)</p>
<p>&#xC18C;&#xBB38;&#xC790;&#xC640; &#xB300;&#xBB38;&#xC790;&#xAC00; &#xAC19;&#xC774; &#xC788;&#xB294;&#xB370; &#xB300;&#xBB38;&#xC790;&#xB294; &#xC18C;&#xBB38;&#xC790;&#xC758; logical NOT &#xC774;&#xB77C;&#xACE0; &#xC0DD;&#xAC01;&#xD558;&#xBA74; &#xB429;&#xB2C8;&#xB2E4;.</p>
<h3 id="s-s"><code>\s</code>, <code>\S</code></h3>
<p><code>\s</code> &#xB294; <code>[[:space:]]</code> &#xB97C; <code>\S</code> &#xB294; <code>[^[:space:]]</code> &#xB97C; &#xB098;&#xD0C0;&#xB0C5;&#xB2C8;&#xB2E4;.</p>
<h3 id="w-w"><code>\w</code>, <code>\W</code></h3>
<p><code>\w</code> &#xB294; <code>[[:alnum:]_]</code> &#xB97C; &#xB098;&#xD0C0;&#xB0C5;&#xB2C8;&#xB2E4;. &#xC989; <code>[:alnum:]</code> &#xD074;&#xB798;&#xC2A4;&#xC5D0; <code>_</code> &#xAC00; &#xCD94;&#xAC00;&#xB41C; &#xAC83;&#xC785;&#xB2C8;&#xB2E4;.<br>(<code>-</code> &#xB294; &#xD3EC;&#xD568;&#xB418;&#xC9C0; &#xC54A;&#xC2B5;&#xB2C8;&#xB2E4;.)</p>
<p><code>\W</code> &#xB294; <code>[^[:alnum:]_]</code> &#xB97C; &#xB098;&#xD0C0;&#xB0C5;&#xB2C8;&#xB2E4;.</p>
<h3 id="y-b"><code>\y</code>, <code>\B</code></h3>
<p>word boundary &#xB97C; &#xB098;&#xD0C0;&#xB0C5;&#xB2C8;&#xB2E4;.</p>
<pre><code class="lang-bash"><span class="hljs-comment"># \y &#xC758; &#xACBD;&#xC6B0;</span>
$ <span class="hljs-built_in">echo</span> <span class="hljs-string">&apos;abc %-= _def.&apos;</span> | awk <span class="hljs-string">&apos;{ gsub(/\y/,&quot;X&quot;) }1&apos;</span>
XabcX %-= X_defX.

<span class="hljs-comment"># \B &#xC758; &#xACBD;&#xC6B0;</span>
$ <span class="hljs-built_in">echo</span> <span class="hljs-string">&apos;abc %-= _def.&apos;</span> | awk <span class="hljs-string">&apos;{ gsub(/\B/,&quot;X&quot;) }1&apos;</span>
aXbXc X%X-X=X _XdXeXf.X

-------------------------------------------------

$ <span class="hljs-built_in">echo</span> <span class="hljs-string">&apos;*foo_bar&apos;</span> | awk <span class="hljs-string">&apos;/\y[a-z]\w+/&apos;</span>
*foo_bar

$ <span class="hljs-built_in">echo</span> <span class="hljs-string">&apos;_foo_bar&apos;</span> | awk <span class="hljs-string">&apos;/\y[a-z]\w+/&apos;</span>
$
</code></pre>
<h3 id=""><code>\&lt;</code>, <code>\&gt;</code></h3>
<p><code>\&lt;</code> &#xB294; word boundary &#xC778;&#xB370; word &#xC758; &#xC2DC;&#xC791; &#xBD80;&#xBD84;&#xC744;, <code>\&gt;</code> &#xB294; word &#xC758; &#xB05D;&#xBD80;&#xBD84;&#xC744; &#xB098;&#xD0C0;&#xB0C5;&#xB2C8;&#xB2E4;.</p>
<pre><code class="lang-bash"><span class="hljs-comment"># &apos;\&lt;&apos; &#xC758; &#xACBD;&#xC6B0;</span>
$ <span class="hljs-built_in">echo</span> <span class="hljs-string">&apos;abc %-= def.&apos;</span> | awk <span class="hljs-string">&apos;{ gsub(/\&lt;/,&quot;X&quot;) }1&apos;</span>
Xabc %-= Xdef.

<span class="hljs-comment"># &apos;\&gt;&apos; &#xC758; &#xACBD;&#xC6B0;</span>
$ <span class="hljs-built_in">echo</span> <span class="hljs-string">&apos;abc %-= def.&apos;</span> | awk <span class="hljs-string">&apos;{ gsub(/\&gt;/,&quot;X&quot;) }1&apos;</span>
abcX %-= defX.
</code></pre>
<h3 id="&#xB300;-&#xC18C;&#xBB38;&#xC790;-&#xAD6C;&#xBD84;-&#xC5C6;&#xC774;-&#xB9E4;&#xCE6D;&#xD558;&#xAE30;">&#xB300;, &#xC18C;&#xBB38;&#xC790; &#xAD6C;&#xBD84; &#xC5C6;&#xC774; &#xB9E4;&#xCE6D;&#xD558;&#xAE30;</h3>
<p>regex &#xB9E4;&#xCE6D;&#xC740; &#xAE30;&#xBCF8;&#xC801;&#xC73C;&#xB85C; &#xB300;, &#xC18C;&#xBB38;&#xC790;&#xB97C; &#xAD6C;&#xBD84;&#xD558;&#xB294;&#xB370;&#xC694;
&#xAD6C;&#xBD84; &#xC5C6;&#xC774; &#xB9E4;&#xCE6D;&#xC744; &#xD558;&#xB824;&#xBA74; &#xB2E4;&#xC74C;&#xACFC; &#xAC19;&#xC740; &#xBC29;&#xBC95;&#xC744; &#xC0AC;&#xC6A9;&#xD560; &#xC218; &#xC788;&#xC2B5;&#xB2C8;&#xB2E4;.</p>
<ul>
<li><code>[ ]</code> &#xC744; &#xC774;&#xC6A9;&#xD558;&#xB294; &#xBC29;&#xBC95;</li>
</ul>
<pre><code class="lang-bash"><span class="hljs-comment"># Foo, foo &#xBAA8;&#xB450; &#xB9E4;&#xCE6D;&#xC774; &#xB41C;&#xB2E4;.</span>
<span class="hljs-variable">$1</span> ~ /[Ff]oo/ { ... }
</code></pre>
<ul>
<li>tolower &#xD568;&#xC218;&#xB97C; &#xC774;&#xC6A9;&#xD558;&#xB294; &#xBC29;&#xBC95;</li>
</ul>
<pre><code class="lang-bash">tolower(<span class="hljs-variable">$1</span>) ~ /foo/ { ... }
</code></pre>
<ul>
<li><code>IGNORECASE</code> builtin &#xBCC0;&#xC218;&#xB97C; &#xC0AC;&#xC6A9;&#xD558;&#xB294; &#xBC29;&#xBC95;</li>
</ul>
<p>&#xAE30;&#xBCF8;&#xAC12;&#xC740; <code>0</code> &#xC778;&#xB370; <code>1</code> &#xB85C; &#xC124;&#xC815;&#xC744; &#xD558;&#xAC8C; &#xB418;&#xBA74; &#xB9E4;&#xCE6D;&#xC2DC; &#xB300;, &#xC18C;&#xBB38;&#xC790; &#xAD6C;&#xBD84;&#xC744; &#xD558;&#xC9C0; &#xC54A;&#xC2B5;&#xB2C8;&#xB2E4;.
&#xC774; &#xBC29;&#xBC95;&#xC744; &#xC0AC;&#xC6A9;&#xD560; &#xB54C; &#xC8FC;&#xC758;&#xD560; &#xC810;&#xC740; &#xBCC0;&#xC218;&#xAC12; &#xC124;&#xC815;&#xC740; &#xD2B9;&#xC815; &#xBE14;&#xB85D;&#xC5D0;&#xB9CC; &#xC801;&#xC6A9;&#xB418;&#xB294; &#xAC83;&#xC774; &#xC544;&#xB2C8;&#xB77C;
&#xC124;&#xC815;&#xB41C; &#xC2DC;&#xC810;&#xBD80;&#xD130; awk &#xBA85;&#xB839;&#xC774; &#xC885;&#xB8CC;&#xB420; &#xB54C;&#xAE4C;&#xC9C0; &#xC18C;&#xC2A4;&#xCF54;&#xB4DC; &#xC804;&#xCCB4;&#xC5D0; &#xC801;&#xC6A9;&#xB41C;&#xB2E4;&#xB294; &#xC810;&#xC785;&#xB2C8;&#xB2E4;.</p>
<pre><code class="lang-bash">x = <span class="hljs-string">&quot;aB&quot;</span>
<span class="hljs-keyword">if</span> (x ~ /ab/) ...   <span class="hljs-comment"># &#xAE30;&#xBCF8; &#xC124;&#xC815;&#xC740; &#xB300;, &#xC18C;&#xBB38;&#xC790;&#xB97C; &#xAD6C;&#xBD84;&#xD558;&#xBBC0;&#xB85C; fail!</span>

IGNORECASE = <span class="hljs-number">1</span>
<span class="hljs-keyword">if</span> (x ~ /ab/) ...   <span class="hljs-comment"># succeed!</span>
</code></pre>


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