PHP 正则（二）

<code class="language-php hljs "><span class="hljs-variable">$str</span> = <span class="hljs-string">"123123,123123,123123,213123,234234"</span>;<span class="hljs-variable">$model</span> = <span class="hljs-string">"/^([0-9]*),(([0-9]*),))*([0-9]*)$/"</span>;<span class="hljs-variable">$match</span> = <span class="hljs-keyword">array</span>();<span class="hljs-variable">$ret</span> = preg_match(<span class="hljs-variable">$model</span>, <span class="hljs-variable">$str</span>, <span class="hljs-variable">$match</span>);<span class="hljs-variable">$match</span> 中就有匹配到的内容。</code>

<code class="language-php hljs "><span class="hljs-variable">$eee</span> = <span class="hljs-string">"(12)-123 23-(233)"</span>;<span class="hljs-comment">//贪婪匹配的例子 这个模式只能匹配 一个。</span><span class="hljs-variable">$preg</span> = <span class="hljs-string">"/\(.*\)/"</span>;<span class="hljs-variable">$match</span> = <span class="hljs-keyword">array</span>();<span class="hljs-variable">$ans</span> = preg_match_all(<span class="hljs-variable">$preg</span>,<span class="hljs-variable">$eee</span>,<span class="hljs-variable">$match</span>);var_dump(<span class="hljs-variable">$match</span>);<span class="hljs-comment">// 结果是只能匹配一个模式。因为第一个从整体看来，是一个完整的括号，所以会匹配整个结果。</span><span class="hljs-comment">//非贪婪匹配模式，可以把所有的括号中的内容都找出来,却别就是*后面的问号。</span><span class="hljs-variable">$preg</span> = <span class="hljs-string">"/\(.*?\)/"</span>;<span class="hljs-variable">$match</span> = <span class="hljs-keyword">array</span>();<span class="hljs-variable">$ans</span> = preg_match_all(<span class="hljs-variable">$preg</span>,<span class="hljs-variable">$eee</span>,<span class="hljs-variable">$match</span>);var_dump(<span class="hljs-variable">$match</span>);</code>

<code class="language-php hljs ">按照正则表达式的规则对匹配的内容进行替换。<span class="hljs-variable">$eee</span> = <span class="hljs-string">"(12)-123 23-(233)"</span>;<span class="hljs-variable">$preg</span> = <span class="hljs-keyword">array</span>(<span class="hljs-string">"/\(.*?\)/"</span>);<span class="hljs-variable">$replace</span> = <span class="hljs-keyword">array</span>(<span class="hljs-string">"haha"</span>);<span class="hljs-variable">$ans</span> = preg_replace(<span class="hljs-variable">$preg</span>,<span class="hljs-variable">$replace</span>,<span class="hljs-variable">$eee</span>);var_dump(<span class="hljs-variable">$ans</span>);</code>

<code class="language-php hljs "><span class="hljs-variable">$str</span> = preg_replace(<span class="hljs-string">"/(<a.*?>)(.*?)(<\/a>)/"</span>,<span class="hljs-string">'\1<span class="link">\2</span>\3'</span>, <span class="hljs-variable">$str</span>); <span class="hljs-comment">// 其中用了三个子模式（每个圆括号中内容为一个子模式），第一个是链接开始标签，第二个是链接文本</span><span class="hljs-comment">// 第三个是</a> 这个正则正则替换的功能是，给所有的链接加上<span>标签，给链接的内容加上样式。</span><span class="hljs-comment">// 通过学习上面的表达是，我们可以将我们前面的例子 转化成这样。</span><span class="hljs-variable">$eee</span> = <span class="hljs-string">"whie2ch(12)-123 23-function(233)"</span>;<span class="hljs-variable">$preg</span> =<span class="hljs-string">"/(\w*)\(.*?\)/"</span>;<span class="hljs-variable">$replace</span> =<span class="hljs-string">"\1word\2bb"</span>; <span class="hljs-comment">// 将变量换成word，将括号及括号里面的内容换成bb \1 \2 代表第几个括号里面匹配的内容。</span><span class="hljs-variable">$ans</span> = preg_replace(<span class="hljs-variable">$preg</span>,<span class="hljs-variable">$replace</span>,<span class="hljs-variable">$eee</span>);var_dump(<span class="hljs-variable">$ans</span>);</code>

<code class="language-php hljs "><span class="hljs-variable">$eee</span> =<span class="hljs-string">"whie2ch(1 \n2)-123 n 23-function nhehe(23 \n3) sfsdf(24 \n5)"</span>;<span class="hljs-variable">$preg</span> =<span class="hljs-string">"/\(.*?\)/"</span>;<span class="hljs-comment">//$replace ="\1word\2bb";</span><span class="hljs-variable">$match</span> = <span class="hljs-keyword">array</span>();<span class="hljs-variable">$ans</span> =preg_match_all(<span class="hljs-variable">$preg</span>,<span class="hljs-variable">$eee</span>,<span class="hljs-variable">$match</span>);var_dump(<span class="hljs-variable">$match</span>);<span class="hljs-comment">// 这样，发现是匹配不到括号里面的内容的。因为.不包括换行。</span><span class="hljs-comment">// 使用方法，把上面的 $preg 改成下面这样。</span><span class="hljs-variable">$preg</span> =<span class="hljs-string">"/\(.*?\)/s"</span>;重新运行程序，发现所有的内容都匹配出来了。</code>