Backend DevelopmentPHP ProblemHow to implement matching and replacement with php regular function
php正则函数实现匹配替换的方法：1、创建一个PHP示例文件；2、创建正则表达式；3、通过preg_replace函数执行正则表达式匹配与替换即可。
本文操作环境：windows7系统、PHP7.1版、DELL G3电脑
php 正则函数怎么实现匹配替换？
php正则表达式的匹配与替换
只介绍两个与Perl兼容的正则表达式函数：
1.preg_match_all 函数执行正则表达式匹配与搜索；
2.preg_replace 函数执行正则表达式匹配与替换。
示例代码：
<?php
// 正则表达式，匹配日期格式
$pattern = "/(\d{2})\/(\d{2})\/(\d{4})/";
$text = "今年国庆节放假日期是10/01/2020到10/07/2020共7天，
10/08/2020开始上班了。";
/*
* 1.正则表达式的模式匹配与替换
*
* $\{1}是正则表达式 $patern 的第一个“()”括号；
* $\{1} 等价于 \\1 ，但最好用前一种，因为后一种不便于字符串之间分隔；
*/
echo preg_replace($pattern, "\${3}-\${1}-\${2}", $text);
echo "<hr><pre class="brush:php;toolbar:false">";
/*
* 2.正则表达式的匹配与搜索
*/
if(preg_match_all($pattern, $text, $matches, PREG_SET_ORDER)){
print_r($matches);
}
echo ""; echo "
匹配到".count($matches)."处字符串。"; echo "
分别是："; foreach($matches as $value){ echo "
".$value[0]; }
执行后的效果：
<?php
/*
* 在使用 preg_replace()函数时，有一个专门为它提供的模式修正符“e”（PHP 7已经弃用），
* 也只有preg_replace()函数使用此修正符。
* 在PHP 7中，preg_replace()函数不再支持“e”，需要使用preg_replace_callback()函数来代替。
*/
//$pattern = "/(<\/?)(\w+)([^>]*>)/e";
$pattern = "/(<\/?)(\w+)([^>]*>)/";
$text = "这个文本中有<b>粗体</b>和<u>带有下划线</u>以下<i>斜体</i>还
有<font color='red' size='8'>带有颜色和字体大小</font>的标记。";
//echo preg_replace($pattern, "'\\1' . strtoupper('\\2') . '\\3'", $text);
echo preg_replace_callback($pattern, function($r){
return $r[1].strtoupper($r[2]).$r[3];
}, $text);执行后的效果：
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