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<ol class="post-toc"><li class="post-toc-item post-toc-level-3"><a class="post-toc-link" href="#正则的介绍"><span class="post-toc-number">1.</span> <span class="post-toc-text">正则的介绍</span></a></li></ol>
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正则表达式
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<strong>Jzxer</strong>
<span>6月 30, 2017</span>
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<script src="/assets/js/APlayer.min.js"> </script><h3 id="正则的介绍"><a href="#正则的介绍" class="headerlink" title="正则的介绍"></a>正则的介绍</h3><pre><code>正则表达式(Regular Expression)是一种文本模式包括普通字符例如a 到 z 之间的字母)和特殊字符(称为&quot;元字符&quot;)。
正则表达式使用单个字符串来描述、匹配一系列匹配某个句法规则的字符串。
正则表达式是烦琐的,但它是强大的,学会之后的应用会让你除了提高效率外,会给你带来绝对的成就感。只要认真阅读本教程,加上应用的时候进行一定的参考,掌握正则表达式不是问题。
许多程序设计语言都支持利用正则表达式进行字符串操作。
</code></pre><p>### </p>
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<i class="material-icons">arrow_forward</i>
</button>
</a>
</nav>
</div>
</div>
<!-- Overlay For Active Sidebar -->
<div class="sidebar-overlay"></div>
<!-- Material sidebar -->
<aside id="sidebar" class="sidebar sidebar-colored sidebar-fixed-left" role="navigation">
<div id="sidebar-main">
<!-- Sidebar Header -->
<div class="sidebar-header header-cover" style="background-image: url(/img/sidebar_header.png);">
<!-- Top bar -->
<div class="top-bar"></div>
<!-- Sidebar toggle button -->
<button type="button" class="sidebar-toggle mdl-button mdl-js-button mdl-js-ripple-effect mdl-button--icon" style="display: initial;" data-upgraded=",MaterialButton,MaterialRipple">
<i class="material-icons">clear_all</i>
<span class="mdl-button__ripple-container">
<span class="mdl-ripple">
</span>
</span>
</button>
<!-- Sidebar Avatar -->
<div class="sidebar-image">
<img src="/img/avatar.png" alt="Jzxer's avatar">
</div>
<!-- Sidebar Email -->
<a data-toggle="dropdown" class="sidebar-brand" href="#settings-dropdown">
710328466@qq.com
<b class="caret"></b>
</a>
</div>
<!-- Sidebar Navigation -->
<ul class="nav sidebar-nav">
<!-- User dropdown -->
<li class="dropdown">
<ul id="settings-dropdown" class="dropdown-menu">
<li>
<a href="710328466@qq.com" target="_blank" title="给我发邮件">
<i class="material-icons sidebar-material-icons sidebar-indent-left1pc-element">email</i>
给我发邮件
</a>
</li>
</ul>
</li>
<!-- Homepage -->
<li id="sidebar-first-li">
<a href="/">
<i class="material-icons sidebar-material-icons">home</i>
主页
</a>
</li>
<li class="divider"></li>
<!-- Archives -->
<li class="dropdown">
<a href="#" class="ripple-effect dropdown-toggle" data-toggle="dropdown">
<i class="material-icons sidebar-material-icons">inbox</i>
归档
<b class="caret"></b>
</a>
<ul class="dropdown-menu">
<li>
<a class="sidebar_archives-link" href="/archives/2018/02/">二月 2018<span class="sidebar_archives-count">2</span></a></li><li><a class="sidebar_archives-link" href="/archives/2018/01/">一月 2018<span class="sidebar_archives-count">6</span></a></li><li><a class="sidebar_archives-link" href="/archives/2017/12/">十二月 2017<span class="sidebar_archives-count">4</span></a></li><li><a class="sidebar_archives-link" href="/archives/2017/11/">十一月 2017<span class="sidebar_archives-count">1</span></a></li><li><a class="sidebar_archives-link" href="/archives/2017/10/">十月 2017<span class="sidebar_archives-count">4</span></a></li><li><a class="sidebar_archives-link" href="/archives/2017/09/">九月 2017<span class="sidebar_archives-count">3</span></a></li><li><a class="sidebar_archives-link" href="/archives/2017/08/">八月 2017<span class="sidebar_archives-count">5</span></a></li><li><a class="sidebar_archives-link" href="/archives/2017/07/">七月 2017<span class="sidebar_archives-count">8</span></a></li><li><a class="sidebar_archives-link" href="/archives/2017/06/">六月 2017<span class="sidebar_archives-count">9</span></a></li><li><a class="sidebar_archives-link" href="/archives/2017/04/">四月 2017<span class="sidebar_archives-count">1</span></a></li><li><a class="sidebar_archives-link" href="/archives/2017/03/">三月 2017<span class="sidebar_archives-count">3</span></a></li><li><a class="sidebar_archives-link" href="/archives/2017/02/">二月 2017<span class="sidebar_archives-count">2</span></a></li><li><a class="sidebar_archives-link" href="/archives/2017/01/">一月 2017<span class="sidebar_archives-count">1</span></a></li><li><a class="sidebar_archives-link" href="/archives/2016/11/">十一月 2016<span class="sidebar_archives-count">1</span></a></li><li><a class="sidebar_archives-link" href="/archives/2016/08/">八月 2016<span class="sidebar_archives-count">1</span></a>
</ul>
</li>
<li class="divider"></li>
<!-- Categories -->
<li class="dropdown">
<a href="#" class="ripple-effect dropdown-toggle" data-toggle="dropdown">
<i class="material-icons sidebar-material-icons">chrome_reader_mode</i>
分类
<b class="caret"></b>
</a>
<ul class="dropdown-menu">
<li>
<a class="sidebar_archives-link" href="/categories/APP/">APP<span class="sidebar_archives-count">1</span></a></li><li><a class="sidebar_archives-link" href="/categories/CSS/">CSS<span class="sidebar_archives-count">2</span></a></li><li><a class="sidebar_archives-link" href="/categories/HTML/">HTML<span class="sidebar_archives-count">2</span></a></li><li><a class="sidebar_archives-link" href="/categories/IDE/">IDE<span class="sidebar_archives-count">1</span></a></li><li><a class="sidebar_archives-link" href="/categories/JS/">JS<span class="sidebar_archives-count">5</span></a></li><li><a class="sidebar_archives-link" href="/categories/nodeJS/">nodeJS<span class="sidebar_archives-count">2</span></a></li><li><a class="sidebar_archives-link" href="/categories/storage/">storage<span class="sidebar_archives-count">1</span></a></li><li><a class="sidebar_archives-link" href="/categories/vue/">vue<span class="sidebar_archives-count">2</span></a></li><li><a class="sidebar_archives-link" href="/categories/web前端/">web前端<span class="sidebar_archives-count">9</span></a></li><li><a class="sidebar_archives-link" href="/categories/web项目/">web项目<span class="sidebar_archives-count">3</span></a></li><li><a class="sidebar_archives-link" href="/categories/博客搭建/">博客搭建<span class="sidebar_archives-count">2</span></a></li><li><a class="sidebar_archives-link" href="/categories/安全/">安全<span class="sidebar_archives-count">1</span></a></li><li><a class="sidebar_archives-link" href="/categories/服务器/">服务器<span class="sidebar_archives-count">2</span></a></li><li><a class="sidebar_archives-link" href="/categories/版本管理/">版本管理<span class="sidebar_archives-count">1</span></a></li><li><a class="sidebar_archives-link" href="/categories/生活/">生活<span class="sidebar_archives-count">8</span></a></li><li><a class="sidebar_archives-link" href="/categories/阅读/">阅读<span class="sidebar_archives-count">1</span></a></li><li><a class="sidebar_archives-link" href="/categories/音乐/">音乐<span class="sidebar_archives-count">6</span></a>
</ul>
</li>
<li class="divider"></li>
<!-- Pages -->
<li>
<a href="/gallery" title="图库">
<i class="material-icons sidebar-material-icons">dashboard</i>
图库
</a>
</li>
<li class="divider"></li>
<li>
<a href="/tags" title="标签">
<i class="material-icons sidebar-material-icons">label</i>
标签
</a>
</li>
<li class="divider"></li>
<li>
<a href="/footprint" title="我的足迹">
<i class="material-icons sidebar-material-icons">flight</i>
我的足迹
</a>
</li>
<li class="divider"></li>
<li>
<a href="/about" title="关于我">
<i class="material-icons sidebar-material-icons">face</i>
关于我
</a>
</li>
<!-- Article Number -->
<li>
<a href="/archives">
文章总数
<span class="sidebar-badge">51</span>
</a>
</li>
</ul>
<!-- Sidebar Footer -->
<!--
I'm glad you use this theme, the development is no so easy, I hope you can keep the copyright, I will thank you so much.
If you still want to delete the copyrights, could you still retain the first one? Which namely "Theme Material"
It will not impact the appearance and can give developers a lot of support :)
很高兴您使用并喜欢该主题,开发不易 十分谢谢与希望您可以保留一下版权声明。
如果您仍然想删除的话 能否只保留第一项呢?即 "Theme Material"
它不会影响美观并可以给开发者很大的支持和动力。 :)
-->
<!-- Sidebar Divider -->
<!-- Theme Material -->
<!-- Help & Support -->
<!--
<a href="mailto:hiviosey@gmail.com" class="sidebar-footer-text-a">
<div class="sidebar-text mdl-button mdl-js-button mdl-js-ripple-effect sidebar-footer-text-div" data-upgraded=",MaterialButton,MaterialRipple">
sidebar.help
<span class="mdl-button__ripple-container">
<span class="mdl-ripple"></span>
</span>
</div>
</a>
-->
<!-- Feedback -->
<!--
<a href="https://github.com/viosey/hexo-theme-material/issues" target="_blank" class="sidebar-footer-text-a">
<div class="sidebar-text mdl-button mdl-js-button mdl-js-ripple-effect sidebar-footer-text-div" data-upgraded=",MaterialButton,MaterialRipple">
sidebar.feedback
<span class="mdl-button__ripple-container"><span class="mdl-ripple"></span></span></div>
</a>
-->
<!-- About Theme -->
<!--
<a href="https://blog.viosey.com/index.php/Material.html" target="_blank" class="sidebar-footer-text-a">
<div class="sidebar-text mdl-button mdl-js-button mdl-js-ripple-effect sidebar-footer-text-div" data-upgraded=",MaterialButton,MaterialRipple">
sidebar.about_theme
<span class="mdl-button__ripple-container"><span class="mdl-ripple"></span></span></div>
</a>
-->
</div>
<!-- Sidebar Image -->
<span id="footer-image">
<a href="#" target="_blank" title="upyun_logo">
<img src="/img/favicon.ico" alt="upyun_logo"><!--
--></a>
</span>
</aside>
<!-- Footer Top Button -->
<div id="back-to-top" class="toTop-wrap">
<a href="#top" class="toTop">
<i class="material-icons footer_top-i">expand_less</i>
</a>
</div>
<!--Footer-->
<footer class="mdl-mini-footer" id="bottom">
<!-- Paradox Footer Left Section -->
<div class="mdl-mini-footer--left-section sns-list">
<!-- Twitter -->
<!-- Facebook -->
<!-- Google + -->
<!-- Weibo -->
<a href="http://weibo.com/5330486979/fans?topnav=1&amp;wvr=6&amp;mod=message&amp;need_filter=1" target="_blank">
<button class="mdl-mini-footer--social-btn social-btn footer-sns-weibo">
<span class="visuallyhidden">Weibo</span>
</button><!--
--></a>
<!-- Instagram -->
<a href="https://www.instagram.com/jzxer/?hl=zh-cn" target="_blank">
<button class="mdl-mini-footer--social-btn social-btn footer-sns-instagram">
<span class="visuallyhidden">Instagram</span>
</button><!--
--></a>
<!-- Tumblr -->
<!-- Github -->
<a href="https://github.com/j710328466" target="_blank">
<button class="mdl-mini-footer--social-btn social-btn footer-sns-github">
<span class="visuallyhidden">Github</span>
</button><!--
--></a>
<!-- LinkedIn -->
<a href="http://www.linkedin.com/in/%E5%BF%97%E9%9B%84-%E6%B1%9F-338928105/" target="_blank">
<button class="mdl-mini-footer--social-btn social-btn footer-sns-linkedin">
<span class="visuallyhidden">LinkedIn</span>
</button><!--
--></a>
<!-- Zhihu -->
<!-- Bilibili -->
<a href="https://space.bilibili.com/73148384/#/" target="_blank">
<button class="mdl-mini-footer--social-btn social-btn footer-sns-bilibili">
<span class="visuallyhidden">Bilibili</span>
</button><!--
--></a>
<!-- Telegram -->
<!-- V2EX -->
</div>
<!--Copyright-->
<div id="copyright">
Copyright&nbsp;©<script type="text/javascript">var fd = new Date();document.write("&nbsp;" + fd.getFullYear() + "&nbsp;");</script>Jzxer's Blog
<br>
<a href="#" rel="nofollow">每天进步一点点~</a>
</div>
<!-- Paradox Footer Right Section -->
<!--
I am glad you use this theme, the development is no so easy, I hope you can keep the copyright.
It will not impact the appearance and can give developers a lot of support :)
很高兴您使用该主题,开发不易,希望您可以保留一下版权声明。
它不会影响美观并可以给开发者很大的支持。 :)
-->
<div class="mdl-mini-footer--right-section">
<div>
<div class="footer-develop-div">Powered by <a href="https://hexo.io" target="_blank" class="footer-develop-a">Hexo</a></div>
<div class="footer-develop-div">Theme - <a href="https://github.com/viosey/hexo-theme-material" target="_blank" class="footer-develop-a">Material</a></div>
</div>
</div>
</footer>
<!-- Import JS File -->
<script>lsloader.load("lazyload_js","/js/lazyload.min.js?1BcfzuNXqV+ntF6gq+5X3Q==", true)</script>
<script>lsloader.load("js_js","/js/js.min.js?V/53wGualMuiPM3xoetD5Q==", true)</script>
<script>lsloader.load("np_js","/js/nprogress.js?pl3Qhb9lvqR1FlyLUna1Yw==", true)</script>
<script type="text/ls-javascript" id="NProgress-script">
NProgress.configure({
showSpinner: true
});
NProgress.start();
$('#nprogress .bar').css({
'background': '#29d'
});
$('#nprogress .peg').css({
'box-shadow': '0 0 10px #29d, 0 0 15px #29d'
});
$('#nprogress .spinner-icon').css({
'border-top-color': '#29d',
'border-left-color': '#29d'
});
setTimeout(function() {
NProgress.done();
$('.fade').removeClass('out');
}, 800);
</script>
<!-- UC Browser Compatible -->
<script>
var agent = navigator.userAgent.toLowerCase();
if(agent.indexOf('ucbrowser')>0) {
document.write('<link rel="stylesheet" href="/css/uc.css">');
alert('由于 UC 浏览器使用极旧的内核,而本网站使用了一些新的特性。\n为了您能更好的浏览推荐使用 Chrome 或 Firefox 浏览器。');
}
</script>
<!-- Import prettify js -->
<script>lsloader.load("prettify_js","/js/prettify.min.js?WN07fivHQSMKWy7BmHBB6w==", true)</script>
<!-- Window Load -->
<!-- add class for prettify -->
<script type="text/ls-javascript" id="window-load">
$(window).on('load', function() {
// Post_Toc parent position fixed
$('.post-toc-wrap').parent('.mdl-menu__container').css('position', 'fixed');
});
$(function() {
$('pre').addClass('prettyprint linenums').attr('style', 'overflow:auto;');
prettyPrint();
})
</script>
<!-- MathJax Load-->
<!-- Bing Background -->
<script type="text/ls-javascript" id="lazy-load">
// Offer LazyLoad
queue.offer(function(){
$('.lazy').lazyload({
effect : 'show'
});
});
// Start Queue
$(document).ready(function(){
setInterval(function(){
queue.execNext();
},200);
});
</script>
<!-- Custom Footer -->
<script>
(function(){
var scriptList = document.querySelectorAll('script[type="text/ls-javascript"]')
for (var i = 0; i < scriptList.length; ++i) {
var item = scriptList[i];
lsloader.runInlineScript(item.id,item.id);
}
})()
console.log('\n %c © Material Theme | Version: 1.5.2 | https://github.com/viosey/hexo-theme-material %c \n', 'color:#455a64;background:#e0e0e0;padding:5px 0;border-top-left-radius:5px;border-bottom-left-radius:5px;', 'color:#455a64;background:#e0e0e0;padding:5px 0;border-top-right-radius:5px;border-bottom-right-radius:5px;');
</script>
</main>
</div>
</body>
</html>