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                  <h2 class="title"><a name="re.summary"></a>7.7.&nbsp;小结
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            <p>这只是正则表达式能够完成工作的很少一部分。换句话说,即使你现在备受打击,相信我,你也不是什么也没见过了。</p>
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         <p>现在,你应该熟悉下列技巧:</p>
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            <ul>
               <li><tt class="literal">^</tt> 匹配字符串的开始。
               </li>
               <li><tt class="literal">$</tt> 匹配字符串的结尾。
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               <li><tt class="literal">\b</tt> 匹配一个单词的边界。
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               <li><tt class="literal">\d</tt> 匹配任意数字。
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               <li><tt class="literal">\D</tt> 匹配任意非数字字符。
               </li>
               <li><tt class="literal">x?</tt> 匹配一个可选的 <tt class="literal">x</tt> 字符 (换言之,它匹配 1 次或者 0 次 <tt class="literal">x</tt> 字符)。
               </li>
               <li><tt class="literal">x*</tt> 匹配0次或者多次 <tt class="literal">x</tt> 字符。
               </li>
               <li><tt class="literal">x+</tt> 匹配1次或者多次 <tt class="literal">x</tt> 字符。
               </li>
               <li><tt class="literal">x{n,m}</tt> 匹配 <tt class="literal">x</tt> 字符,至少 <tt class="literal">n</tt> 次,至多 <tt class="literal">m</tt> 次。
               </li>
               <li><tt class="literal">(a|b|c)</tt> 要么匹配 <tt class="literal">a</tt>,要么匹配 <tt class="literal">b</tt>,要么匹配 <tt class="literal">c</tt></li>
               <li><tt class="literal">(x)</tt> 一般情况下表示一个<span class="emphasis"><em>记忆组 (remembered group)</em></span>。你可以利用 <tt class="function">re.search</tt> 函数返回对象的 <tt class="function">groups()</tt> 函数获取它的值。
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         <p>正则表达式非常强大,但是它并不能为每一个问题提供正确的解决方案。你应该学习足够多的知识,以辨别什么时候它们是合适的,什么时候它们会解决你的问题,什么时候它们产生的问题比要解决的问题还要多。</p>
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                     <p>一些人,遇到一个问题时就想:“<span class="quote">我知道,我将使用正则表达式。</span>”现在他有两个问题了。
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                  <td colspan="2" align="right" valign="top">--<span class="attribution">Jamie Zawinski, <a href="http://groups.google.com/groups?selm=33F0C496.370D7C45%40netscape.com">in comp.emacs.xemacs</a></span></td>
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