从 PHP 中的字符串中去除除字母数字字符以外的所有内容
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Stripping everything but alphanumeric chars from a string in PHP
提问by Click Upvote
I'd like a regexp or other string which can replace everything except alphanumeric chars (a-zand 0-9) from a string. All things such as ,@#$(@*810should be stripped. Any ideas?
我想要一个正则表达式或其他字符串，它可以替换字符串中除字母数字字符（a-z和0-9）之外的所有内容。所有的东西,@#$(@*810都应该被剥离。有任何想法吗？
Edit: I now need this to strip everything but allow dots, so everything but a-z, 1-9, .. Ideas?
编辑：我现在需要它来去除所有东西但允许点，所以除了a-z, 1-9, .. 想法？
回答by gnarf
$string = preg_replace("/[^a-z0-9.]+/i", "", $string);
Matches one or more characters not a-z 0-9 [case-insensitive], or "." and replaces with ""
匹配一个或多个非 az 0-9 [不区分大小写] 或“.”的字符。并替换为“”
回答by Corban Brook
I like using [^[:alnum:]] for this, less room for error.
我喜欢使用 [^[:alnum:]] 来减少出错的空间。
preg_replace('/[^[:alnum:]]/', '', "(ABC)-[123]"); // returns 'ABC123'
回答by SilentGhost
/[^a-z0-9.]/
should do the trick
应该做的伎俩
回答by Ilya Birman
Try:
尝试：
$string = preg_replace ('/[^a-z0-9]/i', '', $string);
/i stands for case insensitivity (if you need it, of course).
/i 代表不区分大小写（当然，如果您需要的话）。
回答by Peter Gluck
This also works to replace anything not a digit, a word character, or a period with an underscore. Useful for filenames.
这也适用于用下划线替换不是数字、单词字符或句点的任何内容。对文件名有用。
$clean = preg_replace('/[^\d\w.]+/', '_', $string);
