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HomeBackend DevelopmentPHP TutorialDetailed explanation of the steps to implement regular expression group capture in PHP

这次给大家带来PHP实现正则表达式分组捕获步骤详解,PHP实现正则表达式分组捕获的注意事项有哪些,下面就是实战案例,一起来看一下。

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.

nbsp;html>


<meta>
<title>检测中文替换文字的正确性</title>

<?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", $line);
    echo "行".$lineNum.":".$line."<br><br><br>";
   }
  }
 } else {
  echo "文件读取失败";
 }
 fclose($file_handle);
?>

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