https://anTtutu.github.io/tags/regexp/ Recent content in Regexp on Anttu's Blog Hugo zh-CN Fri, 07 Jan 2022 00:29:47 +0800 https://anTtutu.github.io/post/2022-01-07-regexp/ Fri, 07 Jan 2022 00:29:47 +0800 https://anTtutu.github.io/post/2022-01-07-regexp/ <h2 id="前言">前言</h2> <p>记录日常工作碰到的一些正则小细节</p> <h2 id="1group分组">1、group分组</h2> <p>需要通过()把提取的参数圈起来，这样才会产生分组</p> <div class="highlight"><div style="background-color:#f7f7f7;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"> <table style="border-spacing:0;padding:0;margin:0;border:0;"><tr><td style="vertical-align:top;padding:0;margin:0;border:0;"> <pre tabindex="0" style="background-color:#f7f7f7;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 1 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 2 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 3 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 4 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 5 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 6 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 7 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 8 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f"> 9 </span><span style="white-space:pre;-webkit-user-select:none;user-select:none;margin-right:0.4em;padding:0 0.4em 0 0.4em;color:#7f7f7f">10 </span></code></pre></td> <td style="vertical-align:top;padding:0;margin:0;border:0;;width:100%"> <pre tabindex="0" style="background-color:#f7f7f7;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-java" data-lang="java"><span style="display:flex;"><span><span style="color:#cf222e">private</span><span style="color:#fff"> </span><span style="color:#cf222e">static</span><span style="color:#fff"> </span>String<span style="color:#fff"> </span><span style="color:#6639ba">collectMapperId</span><span style="color:#1f2328">(</span>String<span style="color:#fff"> </span>value<span style="color:#1f2328">)</span><span style="color:#fff"> </span><span style="color:#1f2328">{</span><span style="color:#fff"> </span></span></span><span style="display:flex;"><span><span style="color:#fff"> </span>String<span style="color:#fff"> </span>result<span style="color:#fff"> </span><span style="color:#0550ae">=</span><span style="color:#fff"> </span><span style="color:#0a3069">&#34;&#34;</span><span style="color:#1f2328">;</span><span style="color:#fff"> </span></span></span><span style="display:flex;"><span><span style="color:#fff"> </span>String<span style="color:#fff"> </span>regId<span style="color:#fff"> </span><span style="color:#0550ae">=</span><span style="color:#fff"> </span><span style="color:#0a3069">&#34;id=\&#34;(.*?)\&#34;&#34;</span><span style="color:#1f2328">;</span><span style="color:#fff"> </span></span></span><span style="display:flex;"><span><span style="color:#fff"> </span>Pattern<span style="color:#fff"> </span>pattern<span style="color:#fff"> </span><span style="color:#0550ae">=</span><span style="color:#fff"> </span>Pattern<span style="color:#1f2328">.</span><span style="color:#1f2328">compile</span><span style="color:#1f2328">(</span>regId<span style="color:#1f2328">);</span><span style="color:#fff"> </span></span></span><span style="display:flex;"><span><span style="color:#fff"> </span>Matcher<span style="color:#fff"> </span>matcher<span style="color:#fff"> </span><span style="color:#0550ae">=</span><span style="color:#fff"> </span>pattern<span style="color:#1f2328">.</span><span style="color:#1f2328">matcher</span><span style="color:#1f2328">(</span>value<span style="color:#1f2328">);</span><span style="color:#fff"> </span></span></span><span style="display:flex;"><span><span style="color:#fff"> </span><span style="color:#cf222e">if</span><span style="color:#fff"> </span><span style="color:#1f2328">(</span>matcher<span style="color:#1f2328">.</span><span style="color:#1f2328">find</span><span style="color:#1f2328">())</span><span style="color:#fff"> </span><span style="color:#1f2328">{</span><span style="color:#fff"> </span></span></span><span style="display:flex;"><span><span style="color:#fff"> </span>result<span style="color:#fff"> </span><span style="color:#0550ae">=</span><span style="color:#fff"> </span>matcher<span style="color:#1f2328">.</span><span style="color:#1f2328">group</span><span style="color:#1f2328">(</span>1<span style="color:#1f2328">);</span><span style="color:#fff"> </span></span></span><span style="display:flex;"><span><span style="color:#fff"> </span><span style="color:#1f2328">}</span><span style="color:#fff"> </span></span></span><span style="display:flex;"><span><span style="color:#fff"> </span><span style="color:#cf222e">return</span><span style="color:#fff"> </span>result<span style="color:#1f2328">;</span><span style="color:#fff"> </span></span></span><span style="display:flex;"><span><span style="color:#fff"> </span><span style="color:#1f2328">}</span><span style="color:#fff"> </span></span></span></code></pre></td></tr></table> </div> </div><p>对比如果没有(),是没有分组效果的</p>