使用正则表达式删除字母数字&以外的任何内容空格(在PHP中) [英] Regular expression to remove anything but alphanumeric & spaces (in PHP)

问题描述

我正在尝试通过正则表达式删除除字母数字字符&以外的所有字符.空格.

I'm trying to remove, via regular expression, all but alphanumeric characters & spaces.

这是我希望实现的转换.

Here's the conversion I am hoping to achieve.

"I am a string" → "I am a string"
"How are you?" → "How are you"
"#53-Jeff" → "53-Jeff"

到目前为止，我有这个:

So far I have this:

return preg_replace("/[^0-9a-zA-Z]/","", $val);

但是作为正则表达式新手，我不知道如何插入空格.尝试时结果很奇怪.

But being a regex novice, I can't figure out how to insert a space. I had odd results when I tried.

推荐答案

插入空格就像您期望的那样简单:

Inserting a space is just as simple as you expect it to be:

preg_replace("/[^0-9a-zA-Z ]/", "", $val);

顺便说一句.您的第三个示例对我来说还不清楚:您是否也要替换-?如果没有，您也需要将其添加到字符列表中.

Btw. your third example is not clear to me: Do you want to replace the - too? If not, you need to add it to the character list too.

有关运行示例，请参见此.

See this for a running example.

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