php 替换除字母、数字、空格和下划线以外的所有字符

Question

提问by Daniel Blackmore

I am looking to replace all characters in a string except letters, numbers, spaces and underscores.

我希望替换字符串中除字母、数字、空格和下划线之外的所有字符。

Could someone please provide a example?

有人可以提供一个例子吗？

Answer 1

I normally use something like:

我通常使用类似的东西：

$string = preg_replace("/[^ \w]+/", "", $string);

That replaces all non-space and non-word characters with nothing.

这将用空替换所有非空格和非单词字符。

Answer 2

[^0-9a-zA-Z_\s]

is what you want to replace.

是你想要更换的。

Answer 3

<?php
$string = 'April 15, 2003';
$pattern = '/[^\w ]+/';
$replacement = '';
echo preg_replace($pattern, $replacement, $string);
?>