Problem with php regular expression html tag matching input, select, textarea

I want to use regular expressions to match the input, select and textarea tags in the html code. No other tags are needed.
My writing is as follows:

<code>$text = "<form name='loginpageform' method='post' action='www.baidu.com'>";
$pattern="/<.*?[input|textarea|select].*?>/i";
preg_match($pattern1,$text,$matches);
var_dump($matches);</code>

But I found that what I wrote can match all tags. I know it is [input|textarea|select]wrong, but I don’t know how to modify it or if there is an easier way to write it. I hope there is a master. You can answer it.

Reply content:

I want to use regular expressions to match the input, select and textarea tags in the html code, and no other tags are needed.
My writing is as follows:

<code>$text = "<form name='loginpageform' method='post' action='www.baidu.com'>";
$pattern="/<.*?[input|textarea|select].*?>/i";
preg_match($pattern1,$text,$matches);
var_dump($matches);</code>

But I found that what I wrote can match all tags. I know it is [input|textarea|select]wrong, but I don’t know how to modify it or if there is an easier way to write it. I hope there is a master. You can answer it.

• [] means matching specified characters, not strings

• (string1|string2) matches multiple strings

• (?! string1) matches non- string

The correct one is:

<code>/<.*?(input|textarea|select).*?>/is</code>

For example

<code>[a-zA-z0-9_\-]     表示匹配 a~z A~Z 0~9 _ - 这些字符 (只有一个字符)

[a-zA-z0-9_\-]*    表示匹配 a~z A~Z 0~9 _ - 只有这些字符的字符串(注意后面的 * )

(input|textarea|select)  表示匹配这些字符串</code>