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href=https://nicksxs.me/2015/01/16/pcre-intro-and-a-simple-package/ itemprop=mainEntityOfPage><span hidden itemprop=author itemscope itemtype=http://schema.org/Person><meta content=/uploads/avatar.jpg itemprop=image><meta content=Nicksxs itemprop=name></span><span hidden itemprop=publisher itemscope itemtype=http://schema.org/Organization><meta content="Nicksxs's Blog" itemprop=name><meta content="Nicksxs 的技术博客,专注 Java、JVM、分布式系统、数据库与大模型工程实践" itemprop=description></span><span hidden itemprop=post itemscope itemtype=http://schema.org/CreativeWork><meta content="pcre-intro-and-a-simple-package | Nicksxs's Blog" itemprop=name><meta content="Perl Compatible Regular Expressions (PCRE) is a regular expression C library inspired by the regular expression capabilities in the Perl pr…" itemprop=description></span><header class=post-header><h1 itemprop="name headline" class=post-title>pcre-intro-and-a-simple-package</h1><div class=post-meta-container><div class=post-meta><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-calendar"></i> </span><span class=post-meta-item-text>发表于</span> <time itemprop="dateCreated datePublished" title="创建时间:2015-01-16 14:30:20" datetime=2015-01-16T14:30:20+08:00>2015-01-16</time> </span><span class=post-meta-item><span class=post-meta-item-icon><i class="far fa-folder"></i> </span><span class=post-meta-item-text>分类于</span> <span itemprop=about itemscope itemtype=http://schema.org/Thing><a href=/categories/C/ itemprop=url rel=index><span itemprop=name>C++</span></a> </span></span><span class="post-meta-item cloudflare-page-counter" data-increment=true data-path=/2015/01/16/pcre-intro-and-a-simple-package/ data-title=pcre-intro-and-a-simple-package title=阅读次数><span class=post-meta-item-icon><i class="far fa-eye"></i> </span><span class=post-meta-item-text>阅读次数:</span> <span class=cloudflare-page-counter-count></span></span></div><div class=post-description>Perl Compatible Regular Expressions (PCRE) is a regular expression C library inspired by the regular expression capabilities in the Perl pr…</div></div></header><div class=post-body itemprop=articleBody><h3 id=Pcre><a class=headerlink href=#Pcre title=Pcre></a><a href=http://www.pcre.org/ rel=noopener target=_blank>Pcre</a></h3><blockquote><p>Perl Compatible Regular Expressions (PCRE) is a regular<br>expression C library inspired by the regular expression<br>capabilities in the Perl programming language, written<br>by Philip Hazel, starting in summer 1997.</blockquote><p>因为最近工作内容的一部分需要做字符串的识别处理,所以就顺便用上了之前在PHP中用过的正则,在C/C++中本身不包含正则库,这里使用的pcre,对MFC开发,在<a href=http://www.psyon.org/projects/pcre-win32/index.php rel=noopener target=_blank>这里</a>提供了静态链接库,在引入lib跟.h文件后即可使用。</p><span id=more></span><h3 id=Regular-Expression-Syntax><a title="Regular Expression Syntax" class=headerlink href=#Regular-Expression-Syntax></a>Regular Expression Syntax</h3><p>然后是一些<a href=http://www.pcre.org/original/doc/html/pcresyntax.html rel=noopener target=_blank>正则语法</a>,官方的语法文档比较科学严谨,特别是对类似于贪婪匹配等细节的说明,当然一般的使用可以在网上找到很多匹配语法,例如<a href=http://www.regextester.com/pregsyntax.html rel=noopener target=_blank>这个</a>。<h3 id=PCRE函数介绍><a class=headerlink href=#PCRE函数介绍 title=PCRE函数介绍></a>PCRE函数介绍</h3><blockquote><p>pcre_compile<br>原型:</blockquote><figure class="highlight c++"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br></pre><td class=code><pre><span class=line><span class=meta>#<span class=keyword>include</span> <span class=string>&LTpcre.h></span></span></span><br><span class=line><span class=function>pcre *<span class=title>pcre_compile</span><span class=params>(<span class=type>const</span> <span class=type>char</span> *pattern, <span class=type>int</span> options, <span class=type>const</span> <span class=type>char</span> **errptr, <span class=type>int</span> *erroffset, <span class=type>const</span> <span class=type>unsigned</span> <span class=type>char</span> *tableptr)</span></span>;</span><br></pre></table></figure><p>功能:将一个正则表达式编译成一个内部表示,在匹配多个字符串时,可以加速匹配。其同pcre_compile2功能一样只是缺少一个参数errorcodeptr。<br>参数:<br><code>pattern</code> 正则表达式<br><code>options</code> 为0,或者其他参数选项<br><code>errptr</code> 出错消息<br><code>erroffset</code> 出错位置<br><code>tableptr</code> 指向一个字符数组的指针,可以设置为空NULL<blockquote><p>pcre_exec<br>原型:</blockquote><figure class="highlight c++"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br></pre><td class=code><pre><span class=line><span class=meta>#<span class=keyword>include</span> <span class=string>&LTpcre.h></span></span></span><br><span class=line><span class=function><span class=type>int</span> <span class=title>pcre_exec</span><span class=params>(<span class=type>const</span> pcre *code, <span class=type>const</span> pcre_extra *extra, <span class=type>const</span> <span class=type>char</span> *subject, <span class=type>int</span> length, <span class=type>int</span> startoffset, <span class=type>int</span> options, <span class=type>int</span> *ovector, <span class=type>int</span> ovecsize)</span></span></span><br></pre></table></figure><p>功能:使用编译好的模式进行匹配,采用与Perl相似的算法,返回匹配串的偏移位置。<br>参数:<br><code>code</code> 编译好的模式<br><code>extra</code> 指向一个pcre_extra结构体,可以为NULL<br><code>subject</code> 需要匹配的字符串<br><code>length</code> 匹配的字符串长度(Byte)<br><code>startoffset</code> 匹配的开始位置<br><code>options</code> 选项位<br><code>ovector</code> 指向一个结果的整型数组<br><code>ovecsize</code> 数组大小。<p>这里是两个最常用的函数的简单说明,pcre的静态库提供了一系列的函数以供使用,可以参考这个<a href=http://blog.csdn.net/sulliy/article/details/6247155 rel=noopener target=_blank>博客</a>说明,另外对于以上函数的具体参数详细说明可以参考官网<a href=http://www.pcre.org/original/doc/html/ rel=noopener target=_blank>此处</a><h3 id=一个丑陋的封装><a class=headerlink href=#一个丑陋的封装 title=一个丑陋的封装></a>一个丑陋的封装</h3><figure class="highlight c++"><table><tr><td class=gutter><pre><span class=line>1</span><br><span class=line>2</span><br><span class=line>3</span><br><span class=line>4</span><br><span class=line>5</span><br><span class=line>6</span><br><span class=line>7</span><br><span class=line>8</span><br><span class=line>9</span><br><span class=line>10</span><br><span class=line>11</span><br><span class=line>12</span><br><span class=line>13</span><br><span class=line>14</span><br><span class=line>15</span><br><span class=line>16</span><br></pre><td class=code><pre><span class=line><span class=function><span class=type>void</span> <span class=title>COcxDemoDlg::pcre_exec_all</span><span class=params>(<span class=type>const</span> pcre * re, PCRE_SPTR src, vector&LTpair<<span class=type>int</span>, <span class=type>int</span>>> &vc)</span></span></span><br><span class=line><span class=function></span>{</span><br><span class=line> <span class=type>int</span> rc;</span><br><span class=line> <span class=type>int</span> ovector[<span class=number>30</span>];</span><br><span class=line> <span class=type>int</span> i = <span class=number>0</span>;</span><br><span class=line> pair<<span class=type>int</span>, <span class=type>int</span>> pr;</span><br><span class=line> rc = <span class=built_in>pcre_exec</span>(re, <span class=literal>NULL</span>, src, <span class=built_in>strlen</span>(src), i, <span class=number>0</span>, ovector, <span class=number>30</span>);</span><br><span class=line> <span class=keyword>for</span> (; rc > <span class=number>0</span>;)</span><br><span class=line> {</span><br><span class=line> i = ovector[<span class=number>1</span>];</span><br><span class=line> pr.first = ovector[<span class=number>2</span>];</span><br><span class=line> pr.second = ovector[<span class=number>3</span>];</span><br><span class=line> vc.<span class=built_in>push_back</span>(pr);</span><br><span class=line> rc = <span class=built_in>pcre_exec</span>(re, <span class=literal>NULL</span>, src, <span class=built_in>strlen</span>(src), i, <span class=number>0</span>, ovector, <span class=number>30</span>);</span><br><span class=line> }</span><br><span class=line>}</span><br></pre></table></figure><p>vector中是全文匹配后的索引对,只是简单地用下。</div><footer class=post-footer><div class="affiliate-creative affiliate-creative--post-end" data-affiliate-id=tencent-cloud-general><a rel="sponsored noopener" aria-label=腾讯云产品优惠 href=https://cloud.tencent.com/act/cps/redirect?redirect=2446&cps_key=2e33a1eedb380997d03618b4a5ba6ca7&from=console target=_blank><img alt=腾讯云服务器、数据库和云产品优惠 decoding=async height=419 loading=lazy src=/uploads/affiliate/tencent-cloud-general.webp width=690> </a><span class=affiliate-disclosure>推广</span></div><div class=reward-container><div>请我一杯咖啡吧!</div><button>赞赏</button><div class=post-reward><div><img alt="Nicksxs 微信" src=https://i.loli.net/2020/01/12/NUlWanT31E8LQGx.png><span>微信</span></div><div><img alt="Nicksxs 支付宝" src=https://ooo.0o0.ooo/2016/08/17/57b421e773057.jpg><span>支付宝</span></div></div></div><div class=post-copyright><ul><li class=post-copyright-author><strong>本文作者: </strong>Nicksxs<li 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