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PHP implements regular expression group capture operation example php skills
PHP implements regular expression group capture operation example php skills
这篇文章主要介绍了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
本文实例讲述了PHP实现正则表达式分组捕获操作。分享给大家供大家参考，具体如下：
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.
<!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='red'>$0</font>", $line);
echo "行".$lineNum."：".$line."<br/><br/><br/>";
}
}
} else {
echo "文件读取失败";
}
fclose($file_handle);
?>
</html>相关问题参考文章：
用 PHP 读取文件的正确方法
掌握 PHP 中的正则表达式(1)
掌握 PHP 中的正则表达式(2)
PS：这里再为大家提供2款非常方便的正则表达式工具供大家参考使用：
JavaScript正则表达式在线测试工具：
http://tools.jb51.net/regex/javascript
正则表达式在线生成工具：
http://tools.jb51.net/regex/create_reg
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