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Home Backend Development PHP Tutorial PHP regular expression group capture implementation method

PHP regular expression group capture implementation method

小云云
小云云
Feb 05, 2018 am 09:15 AM
php accomplish expression

本文主要和大家介绍PHP实现正则表达式分组捕获操作,结合实例形式分析了php正则表达式获取分组捕获操作的相关实现方法与使用注意事项,需要的朋友可以参考下，希望能帮助到大家。

经过测试，发现php正则表达式获取分组捕获是从$0开始，而平时工作中JavaScript中的正则是$1..$9

在提取项目代码中的汉字时，因为当时操作速度很快(赶时间)，很担心当时.properties的文件{\d}的数字顺序搞错了：

1、可能从{1}开始，而不是从{0}开始

2、可能跳着写了，比如第一个是{0}第二个需要替换的地方却写着{2}

因为使用人工手动操作的，所以这种情况是难以避免，只能说减少误操作。写完了，得再检查一遍，这个遇到困难了，二三千行的代码，用眼睛一行一行查，那的比较累了，而且还不一定能检查出来。一多就容易出错，而且行与行之间靠的太近了，字又太小…

突然想起来，觉得php可以节省一点时间，读取文件，然后将关键的地方标红…

然后就开始了：php读取文件，然后逐行的读取，使用正则表达式匹配符合{\d}的行，然后将{\d}的地方使用红色进行重点的标记，之后人工去查看每一行是能是符合规则。代码不对，却很受用，至少省了用眼睛去一个一个检查的时间：

这样一眼扫过去，就能很清楚的看出每一行顺序是否都写对了，写错了的行，前面有行号，找到相应行再改改.


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<!Doctype html>

<html>

<head>

<meta http-equiv="Content-Type" content="text/html;charset=utf-8">

<title>检测中文替换文字的正确性</title>

</head>

<?php

 $filename = "C:\test.properties";

 $mode = "r";

 $file_handle = fopen($filename, $mode);

 $lineNum = 0;

 $pattern = "/{\d}[^{}]+/";

 if ($file_handle) {

  while (!feof($file_handle)) {

   ++$lineNum;

   $line = fgets($file_handle);

   if (preg_match($pattern, $line)) {

    $line = preg_replace("/{\d}/", "<font color=&#39;red&#39;>$0</font>", $line);

    echo "行".$lineNum."：".$line."<br/><br/><br/>";

   }

  }

 } else {

  echo "文件读取失败";

 }

 fclose($file_handle);

?>

</html>

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相关推荐：

PHP之正则表达式捕获组与非捕获组的详解

捕获未处理的Promise错误

Node.js 中的未捕获异常怎么解决

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