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                ??一站式輕松地調用各大LLM模型接口,支持GPT4、智譜、豆包、星火、月之暗面及文生圖、文生視頻 廣告
                # 第八課 正則表達式 > 常用正則 ``` <pre class="calibre14">``` <span class="token2">(</span><span class="token2">[</span>\s\S<span class="token2">]</span><span class="token">*</span><span class="token">?</span><span class="token2">)</span> 表示任意多個字符<span class="token2">,</span>換行也可以匹配 <span class="token2">(</span><span class="token2">[</span>\s<span class="token">*</span><span class="token2">]</span><span class="token">+</span><span class="token2">)</span> 匹配一個或多個空格 <span class="token2">(</span><span class="token2">[</span>\s<span class="token2">,</span><span class="token2">]</span><span class="token">+</span><span class="token2">)</span> 匹配多個空格或逗號 <span class="token2">(</span><span class="token2">[</span><span class="token2">,</span><span class="token2">]</span><span class="token">+</span><span class="token2">)</span> 匹配多個逗號 <span class="token">/</span>php<span class="token">/</span>i 不區分大小寫 <span class="token">^</span> $ 匹配開始結束字符 <span class="token2">.</span> 匹配除換行以外字符串 <span class="token">?</span> <span class="token3">0</span>次 或 <span class="token3">1</span>次 等價<span class="token2">{</span><span class="token3">0</span><span class="token2">,</span><span class="token3">1</span><span class="token2">}</span> <span class="token">*</span> <span class="token3">0</span>次 或 多次 等價<span class="token2">{</span><span class="token3">0</span><span class="token2">,</span><span class="token2">}</span> <span class="token">+</span> <span class="token3">1</span>次 或 多次 等價<span class="token2">{</span><span class="token3">1</span><span class="token2">,</span><span class="token2">}</span> <span class="token">-</span> 表示范圍 <span class="token2">[</span><span class="token2">]</span> 開始結束字符類定義 \d 任意<span class="token3">10</span>進制數字 <span class="token2">[</span><span class="token3">0</span><span class="token">-</span><span class="token3">9</span><span class="token2">]</span> \s 任意空白字符 單個 \S 任意非空白字符 \w 任意單詞字符 等價<span class="token2">[</span>a<span class="token">-</span>zA<span class="token">-</span>Z0<span class="token">-</span><span class="token3">9</span><span class="token2">]</span> <span class="token2">(</span><span class="token">?</span><span class="token2">:</span>中國<span class="token">|</span>美國<span class="token2">)</span><span class="token2">(</span><span class="token2">.</span><span class="token">*</span><span class="token2">)</span> 匹配中國<span class="token2">,</span>美國開頭的字符串 <span class="token2">(</span>\d<span class="token">+</span>\<span class="token2">.</span>\d<span class="token">+</span>\<span class="token2">.</span>\d<span class="token">+</span>\<span class="token2">.</span>\d<span class="token">+</span><span class="token2">)</span> IP <span class="token2">(</span><span class="token2">[</span>a<span class="token">-</span>zA<span class="token">-</span>Z<span class="token2">]</span><span class="token2">[</span>a<span class="token">-</span>zA<span class="token">-</span>Z0<span class="token">-</span><span class="token3">9</span>_<span class="token2">]</span><span class="token2">)</span> 匹配是否合法字母開頭 <span class="token2">(</span>\d<span class="token">-</span>\d<span class="token">|</span>\d<span class="token">-</span>\d<span class="token2">)</span> 電話號碼 <span class="token2">[</span><span class="token3">1</span><span class="token">-</span><span class="token3">9</span><span class="token2">]</span><span class="token2">[</span><span class="token3">0</span><span class="token">-</span><span class="token3">9</span><span class="token2">]</span> qq <span class="token">^</span><span class="token2">[</span>\w\<span class="token2">.</span>\<span class="token">-</span><span class="token2">]</span><span class="token">+</span>@\w<span class="token">+</span><span class="token2">(</span><span class="token2">[</span>\<span class="token2">.</span>\<span class="token">-</span><span class="token2">]</span>\w<span class="token">+</span><span class="token2">)</span><span class="token">*</span>\<span class="token2">.</span>\w<span class="token">+</span>$ email href<span class="token">=</span><span class="token4">"(.*?)"</span> 超鏈接 <span class="token">/</span><span class="token">^</span>\d<span class="token2">{</span><span class="token3">1</span><span class="token2">,</span><span class="token3">6</span><span class="token2">}</span>$<span class="token">/</span> 匹配<span class="token3">0</span><span class="token">-</span><span class="token3">999999</span> <span class="token">/</span>\d<span class="token2">{</span><span class="token3">4</span><span class="token2">}</span>年\d<span class="token2">{</span><span class="token3">1</span><span class="token2">,</span><span class="token3">2</span><span class="token2">}</span>月\d<span class="token2">{</span><span class="token3">1</span><span class="token2">,</span><span class="token3">2</span><span class="token2">}</span><span class="token">/</span> 匹配年月日 ``` ``` > preg\_math 匹配一次,成功返回 true ``` <pre class="calibre14">``` <span class="token1">preg_match</span><span class="token2">(</span><span class="token4">"/\<center>([\s\S]*?)<\/center\>/"</span><span class="token2">,</span>$str<span class="token2">,</span>$rs<span class="token2">)</span><span class="token2">;</span> ``` ``` > preg\_match\_all匹配多次,成功返回true ``` <pre class="calibre14">``` <span class="token1">preg_match_all</span><span class="token2">(</span><span class="token4">"/\<center>([\s\S]*?)<\/center\>/"</span><span class="token2">,</span>$str<span class="token2">,</span>$rs<span class="token2">)</span><span class="token2">;</span> ``` ``` > preg\_replace 匹配替換,替換成$re ``` <pre class="calibre14">``` $rs <span class="token">=</span><span class="token1">preg_replace</span><span class="token2">(</span><span class="token4">"/\<center>([\s\S]*?)<\/center\>/"</span><span class="token2">,</span>$re<span class="token2">,</span>$str<span class="token2">)</span><span class="token2">;</span> ``` ``` > preg\_split分割成數組 ``` <pre class="calibre14">``` $arr <span class="token">=</span> <span class="token1">preg_split</span><span class="token2">(</span><span class="token4">'/([\s*]+)/'</span><span class="token2">,</span><span class="token4">"a b c d ef"</span><span class="token2">)</span><span class="token2">;</span> ``` ``` 替換 ``` <pre class="calibre14">``` $str <span class="token">=</span> <span class="token4">"選項[http://127.0.0.1/weixin/addons/yoby_diyform/weui/fm.jpg]你好"</span><span class="token2">;</span> $str1 <span class="token">=</span> <span class="token1">preg_replace</span><span class="token2">(</span><span class="token4">"/(?:\[)(.*?)(?:\])/i"</span><span class="token2">,</span> <span class="token4">"<img src=\"\${1}\" />"</span><span class="token2">,</span> $str<span class="token2">)</span><span class="token2">;</span> <span class="token1">preg_replace</span><span class="token2">(</span><span class="token4">"/.*\|(.*?)\|.*/i"</span><span class="token2">,</span> <span class="token4">"\${1}"</span><span class="token2">,</span> $v<span class="token2">)</span><span class="token2">;</span> 字符<span class="token">|</span><span class="token3">120000</span><span class="token">|</span>來了 輸出<span class="token3">120000</span> ``` ``` \\s+ 多個空白 \[^>\] >左邊任意字符 .\*? 任意多個字符 \\d+ 匹配數字 ``` <pre class="calibre14">``` <span class="token6">/*獲取html并用正則處理*/</span> <span class="token5">function</span> <span class="token1">get_content</span><span class="token2">(</span>$url<span class="token2">)</span><span class="token2">{</span> $html <span class="token">=</span> <span class="token1">file_get_contents</span><span class="token2">(</span>$url<span class="token2">)</span><span class="token2">;</span> $code<span class="token">=</span> <span class="token1">mb_detect_encoding</span><span class="token2">(</span>$html<span class="token2">,</span> <span class="token1">array</span><span class="token2">(</span><span class="token4">"GB2312"</span><span class="token2">,</span><span class="token4">"GBK"</span><span class="token2">,</span><span class="token4">'UTF-8'</span><span class="token2">,</span><span class="token4">'BIG5'</span><span class="token2">)</span><span class="token2">)</span><span class="token2">;</span><span class="token6">//獲取編碼</span> <span class="token5">if</span><span class="token2">(</span>$code<span class="token">!=</span><span class="token4">"UTF-8"</span><span class="token2">)</span><span class="token2">{</span> $htmls <span class="token">=</span> <span class="token1">mb_convert_encoding</span><span class="token2">(</span>$html<span class="token2">,</span> <span class="token4">"UTF-8"</span><span class="token2">,</span> $code<span class="token2">)</span><span class="token2">;</span><span class="token6">//轉換內容為UTF-8編碼</span> <span class="token2">}</span><span class="token5">else</span><span class="token2">{</span> $htmls <span class="token">=</span> $html<span class="token2">;</span> <span class="token2">}</span> $htmls <span class="token">=</span> <span class="token1">preg_replace</span><span class="token2">(</span><span class="token4">"/<script[\s\S]*?<\/script>/i"</span><span class="token2">,</span><span class="token4">""</span><span class="token2">,</span>$htmls<span class="token2">,</span><span class="token">-</span><span class="token3">1</span><span class="token2">)</span><span class="token2">;</span><span class="token6">//去除script</span> $htmls <span class="token">=</span> <span class="token1">preg_replace</span><span class="token2">(</span><span class="token4">"/<noscript[\s\S]*?<\/noscript>/i"</span><span class="token2">,</span><span class="token4">""</span><span class="token2">,</span>$htmls<span class="token2">,</span><span class="token">-</span><span class="token3">1</span><span class="token2">)</span><span class="token2">;</span><span class="token6">//去除noscript</span> $htmls<span class="token">=</span><span class="token1">preg_replace</span><span class="token2">(</span><span class="token4">"/<(\/?link.*?)>/si"</span><span class="token2">,</span><span class="token4">""</span><span class="token2">,</span>$htmls<span class="token2">)</span><span class="token2">;</span><span class="token6">//去掉link</span> $htmls<span class="token">=</span><span class="token1">preg_replace</span><span class="token2">(</span><span class="token4">"/<(style.*?)>(.*?)<(\/style.*?)>/si"</span><span class="token2">,</span><span class="token4">""</span><span class="token2">,</span>$htmls<span class="token2">)</span><span class="token2">;</span><span class="token6">//去掉style</span> $htmls <span class="token">=</span><span class="token1">preg_replace</span><span class="token2">(</span><span class="token4">"/style=.+?['|\"]/i"</span><span class="token2">,</span><span class="token4">''</span><span class="token2">,</span>$htmls<span class="token2">,</span><span class="token">-</span><span class="token3">1</span><span class="token2">)</span><span class="token2">;</span><span class="token6">//去除style行內樣式</span> $htmls <span class="token">=</span><span class="token1">preg_replace</span><span class="token2">(</span><span class="token4">'#<!--[^\!\[]*?(?<!\/\/)-->#'</span> <span class="token2">,</span> <span class="token4">''</span> <span class="token2">,</span> $htmls<span class="token2">)</span><span class="token2">;</span><span class="token6">//去掉html注釋</span> $htmls <span class="token">=</span> <span class="token1">preg_replace</span><span class="token2">(</span><span class="token4">"/<a[^>]*>(.*?)<\/a>/is"</span><span class="token2">,</span> <span class="token4">"$1"</span><span class="token2">,</span> $htmls<span class="token2">)</span><span class="token2">;</span><span class="token6">//去除外站超鏈接</span> $htmls <span class="token">=</span> <span class="token1">preg_replace</span><span class="token2">(</span><span class="token4">"/(\n\r)/i"</span><span class="token2">,</span> <span class="token4">''</span><span class="token2">,</span> $htmls<span class="token2">)</span><span class="token2">;</span> <span class="token6">//去掉空行</span> <span class="token5">return</span> $htmls<span class="token2">;</span> <span class="token2">}</span> <span class="token1">preg_match</span><span class="token2">(</span><span class="token4">'/<div class="infoBox-list".*?>.*?<div class="news-page clearfix">/ism'</span><span class="token2">,</span> $htmls<span class="token2">,</span> $rs<span class="token2">)</span><span class="token2">;</span> $htmls <span class="token">=</span> $rs<span class="token2">[</span><span class="token3">0</span><span class="token2">]</span><span class="token2">;</span><span class="token6">//獲取兩個class之間內容</span> $url <span class="token">=</span> <span class="token2">(</span><span class="token1">preg_match</span><span class="token2">(</span><span class="token4">'/^http(s)?:\\/\\/.+/'</span><span class="token2">,</span>$url<span class="token2">)</span><span class="token2">)</span><span class="token">?</span>$url<span class="token2">:</span>"http<span class="token2">:</span><span class="token">/</span><span class="token">/</span> "<span class="token2">.</span>$url<span class="token2">;</span><span class="token6">//判斷是否包含https/http</span> <span class="token1">preg_match</span><span class="token2">(</span><span class="token4">"/src=\"\/?(.*?)\"/"</span><span class="token2">,</span>$content<span class="token2">,</span>$match<span class="token2">)</span><span class="token2">;</span> 第一張圖片 ``` ``` ``` <pre class="calibre16">``` <span class="token2">[</span>\u4e00<span class="token">-</span>\u9fa5<span class="token2">]</span><span class="token2">{</span><span class="token3">0</span><span class="token2">,</span><span class="token2">}</span> 匹配中文 \d<span class="token">+</span> 匹配<span class="token">>=</span><span class="token3">0</span>數字 <span class="token2">[</span>a<span class="token">-</span>zA<span class="token">-</span>Z<span class="token2">]</span><span class="token">+</span> 不區分大小寫<span class="token3">26</span>個字母 <span class="token2">[</span>A<span class="token">-</span>Za<span class="token">-</span>z0<span class="token">-</span><span class="token3">9</span><span class="token2">]</span><span class="token">+</span> 英文與數字 \s<span class="token">+</span> 多個空格 <span class="token2">[</span><span class="token3">0</span><span class="token">-</span><span class="token3">9</span><span class="token2">]</span><span class="token">*</span> 匹配一串數字 \d<span class="token2">{</span><span class="token3">4</span><span class="token2">}</span> 匹配四位數字 \d<span class="token2">{</span><span class="token3">5</span><span class="token2">,</span><span class="token2">}</span> 匹配至少<span class="token3">5</span>位數 \d<span class="token2">{</span><span class="token3">4</span><span class="token2">,</span><span class="token3">10</span><span class="token2">}</span> 匹配<span class="token3">4</span><span class="token">-</span><span class="token3">10</span>位數 ``` ```
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