用preg_replace（）替换不推荐使用的ereg_replace（）无效 [英] Replacing deprecated ereg_replace() with preg_replace() did not work

问题描述

以下PHP程序替换符号！£$％^&用空值

The following PHP program replaces the symbols !£$%^& with nulls

 <?php

 $string = "This is some text and numbers 12345 and symbols !£$%^&";
 $new_string = ereg_replace("[^A-Za-z0-9 (),.]", "", $string);
 echo "Old string is: ".$string."<br />New string is: ".$new_string;

 ?>

输出：

旧字符串为：这是一些文本和数字12345和符号！£$％^&

新字符串是：这是一些文本和数字12345和符号

Old string is: This is some text and numbers 12345 and symbols !£$%^&
New string is: This is some text and numbers 12345 and symbols

但是，我了解到不建议使用ereg_replace（）函数，而应改用preg_replace（）函数。我做了这样的替换：

But, I have learned that the function ereg_replace() has been deprecated and that I should use the function preg_replace() instead. I made the substitution like so:

 <?php

 $string = "This is some text and numbers 12345 and symbols !£$%^&";
 $new_string = preg_replace("[^A-Za-z0-9 (),.]", "", $string);
 echo "Old string is: ".$string."<br />New string is: ".$new_string;

 ?>

但输出错误：

旧字符串是：这是一些文本，数字12345和符号！£$％^&
新字符串是：这是一些文本和数字12345和符号！£$％^&

Old string is: This is some text and numbers 12345 and symbols !£$%^& New string is: This is some text and numbers 12345 and symbols !£$%^&

我怎么了？我该如何解决？

What did I do wrong? How do I fix it?

推荐答案

您似乎在正则表达式周围缺少标记。请改用此方法（注意图案周围的斜线）。

You seem to be missing markers around the regular expression. Try this instead (note the slashes around the pattern).

$string = "This is some text and numbers 12345 and symbols !$%^&";
$new_string = preg_replace("/[^A-Za-z0-9 (),.]/", "", $string);
echo "Old string is: ".$string."<br />New string is: ".$new_string;

您可以使用任意字符作为标记，只要双方都找到相同的字符即可。如果您的模式匹配 / 字符，则非常有用。因此，这也是有效的：

You can use any character for the markers as long as the same one is found on both sides. Very useful if your pattern is matching / characters. So this is also valid:

$string = "This is some text and numbers 12345 and symbols !$%^&";
$new_string = preg_replace("~[^A-Za-z0-9 (),.]~", "", $string);
echo "Old string is: ".$string."<br />New string is: ".$new_string;

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