[英]How can I use regex to remove a line from a file with PHP?
I am writing an extension to CodeIgniter's language class that will remove a certain language line from a certain file. 我正在编写CodeIgniter语言类的扩展,它将从特定文件中删除特定语言行。 The script is provided an array key to determine which file line to remove. 为脚本提供了一个数组键,以确定要删除的文件行。 I don't believe I have written my regex properly to detect a config file line. 我不相信我已经正确编写了正则表达式来检测配置文件行。 Here is the cat_names language file: 这是cat_names语言文件:
<?php
$lang['cat_123'] = 'Transportation';
$lang['cat_124'] = 'Restaurants';
This is my language class extension: 这是我的语言课扩展:
public function remove_line($line, $file){
$CI =& get_instance();
$CI->load->helper('file');
foreach($this->existing_langs as $lang){
$lang_contents = read_file($this->lang_path.'/'.$lang.'/'.$file.'_lang.php');
$new_contents = preg_replace("^$lang\[\$line\] \= (.*?)\\n^", '', $lang_contents);
write_file($this->lang_path.'/'.$lang.'/'.$file.'_lang.php', 'w+');
}
}
I use the following to call the method that removes lines from the language file: 我使用以下方法来调用从语言文件中删除行的方法:
$this->lang->remove_line('cat_123', 'cat_names');
Why isn't my preg_replace removing the lines? 为什么我的preg_replace不删除行? Note: the language file is not read-only. 注意:语言文件不是只读的。
"^$lang\[\$line\] \= (.*?)\\n^"
"^\\$"."lang\['$line'\] = (.*?)\n^"
Your RegEx doesn't work because: 您的RegEx无法正常运作,因为:
$lang
in double quoted string is interpreted as variable (also, this variable doesn't exist); 双引号字符串中的$lang
被解释为变量(同样,该变量不存在); '
inside square brackets; 你缺少单引号'
方括号内; $line
, which is a variable, is escaped. $line
是一个变量,被转义。 Change it in this way: 以这种方式更改它:
"^\\$"."lang\['$line'\] = (.*?)\n^"
Also note that the =
does not need to be escaped and the way to escape $
followed by characters. 还要注意, =
不需要转义,转义$
的方式后面是字符。
In addition, I suggest you use a single-quoted string and set delimiters to another character (in regular expressions ^
means begin of line. Here it works, but can be confusing). 另外,我建议您使用单引号引起来的字符串,并将定界符设置为另一个字符(在正则表达式中^
表示行的开头。在这里可以使用,但可能会造成混淆)。
This is single-quote equivalent with different delimiters: 这是带不同分隔符的单引号等效项:
'/\$lang\[\''.$line.'\'\] = (.*?)\n/'
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